When comparing Undertale vs Portal, the Slant community recommends Portal for most people. In the question“What are the best singleplayer games on Steam?” Portal is ranked 10th while Undertale is ranked 62nd. The most important reason people chose Portal is:
The main mechanic of the game revolves around solving different puzzles using a handheld portal device - a device that can bend space and time to create a wormhole through which you can move.
Specs
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Pros
Pro Incredible soundtrack
Just like the simple but pleasant graphics in the game, the music matches this with a retro-sounding score that fits right in with the art style. There are a lot of catchy tunes that only use a few sounds to make up memorable songs. The simplicity really adds to the charm, with some of the songs easily able to get stuck in your head for days at a time. It's nostalgic enough for older gamers who grew up in the early eras of gaming, while still having enough to pull in newer gamers who aren't as familiar with games from the 1980s and 90s. There's something here for everyone.
Pro Amazing characters
The characters in the game are written well, each with their own unique personalities. Some may be too shy, and will lower their hit points when you attack them in battle, just to avoid offending you. Others are deeply caring and do their best to help and protect their friends and family, including you as the player. Many of the characters are quite funny in their dialog and the unexpected choices they make throughout the story, including the ways they react to your choices. Almost every character is incredibly memorable and enjoyable to get to know better.
Pro Many interesting secrets to find
There are many secrets to discover in the game, like hidden mechanics that might take you by surprise. It may take a couple of playthroughs to find them all, but once you do, it may completely change how you see the story, the characters, and a lot more. There's a lot more to Undertale beneath its simple-looking surface.
Pro Your choices lead you down different story paths
Depending on your choices, your playthrough can change in drastic ways. If you don't want to kill enemies in battle, you can choose to have a dialog with them instead. Doing this consistently is basically a pacifist playthrough where you don't kill anyone, and characters respond to you in certain ways based on that. Or you can go for a genocide playthrough, which is basically what it sounds like, where you kill everyone you come across whenever you get the chance. This can have serious consequences, since the game does its best to make you feel bad about this approach, by having certain characters hate you. It's an interesting way to get to see the world and story from different angles.
Pro Requires solving spatial and physics based puzzles using portals
The main mechanic of the game revolves around solving different puzzles using a handheld portal device - a device that can bend space and time to create a wormhole through which you can move.
Pro Humorous telling of a dark story
Portal is known for its humor. Even years after it's been out in the world people are still quoting and referencing it in everyday situations.
Pro The game leaves clues to a deeper story
Throughout both Portal games there are hints left in various forms that fill in more of the story, including information about Chell's personal history.
Pro Innovative gameplay
Portal has won multiple awards for innovative design. Using a first person view and portals that allow one to traverse a room through one placed in one location to the other placed in another location to solve puzzles was and still is a very unique game design.
Pro Created one of the most memorable characters in gaming history - GLaDOS
GLaDOS, or Genetic Lifeform and Disk Operating System, is the main antagonist of Portal games. She is voiced by Ellen McLain with the voice later processed to sound closer to how a text-to-speech program would synthesize a voice.
GLaDOS initially functions as a guide to the player and is only later revealed as a manipulative, narcissistic, sinister and passive-aggressive character that wants to kill the protagonist.
GLaDOS is the main force that moves the humorous yet dark narrative of Portal series with her remarks being simultaneously hilarious and terrifying.
Pro Character-driven
Even though the only organic sentient being in this game is the player's character, this game features some of the most memorable and intriguing characters in fiction or in gameplay. GladOS obviously, but also the drone robots that sweet-talk the player to a sudden death (and then forgive you when you dismantle them), the clues left behind by former test subjects, the abandoned hints of what the lab used to be like. It tells a story without telling a story, and immerses you more than most other games can ever hope to achieve.
Pro Made people fall in love with an inanimate, virtual object
The game made people emotionally attach to The Weighted Companion Cube and feel uncomfortable when later forced to incinerate it.
Pro Merges first-person shooting mechanics with platforming and puzzle-solving
Portal uses an engine that was meant for a first person shooter and creates puzzles that need solved through various stage with the use of platforming. While not the very first game to merge platforming with and FPS the puzzle aspects make it unique in that no other game had done this specific combination yet.
Pro Making it halfway and completing unlocks new content
Getting to the halfway point in Portal will unlock challenge maps and finishing the main story will unlock advanced chambers.
Pro The sequel contains an AI powered by a potato
If that is not funny, then nothing is.
Cons
Con Replaying can be a chore
The first time going through the game it's a nice experience, especially when you know nothing about the characters, story, mechanics, etc.. By your next playthrough, you already know all the jokes and plot points. Even when taking a new route, it can take a while for you to notice anything different from one playthrough to the next, making things feel like a drag.
Con The visuals could be better
Much of the game is plain-looking with simple graphics, but sometimes the visuals are just awful. The pixel art can be charming for some players, though it's hard to ignore when certain areas are barren or have ugly textures. It's notable that a single person created the whole game; it would have been nice if they'd had more time or resources to clean up some of the visual problems.
Con Community
The community is not very mature. That's all.
Con Punishes you for playing an RPG game like you would normally do
Remember when you accidentally killed that monster? Well, we're going to make you hate yourself for it.
Con Somewhat short
Portal takes 2-3 hours to complete which means it can be completed in one sitting. This may not be enough game for the money for some people and should be considered before purchasing.
Con Portal mechanics not used much to their best ability
Certain parts of the game sees the player using portals to manipulate sentry guns that fire rockets in order to progress in that stage, Mechanics like this make for a really enjoyable way to manipulate ones environment but sadly are not used too often.
Con Outdated graphics
The game was released in 2007, making it somewhat of an older title, because of this the graphics will not be on par with modern releases.