When comparing No Man's Sky vs Rogue Legacy, the Slant community recommends Rogue Legacy for most people. In the question“What are the best indie games on Steam?” Rogue Legacy is ranked 40th while No Man's Sky is ranked 82nd. The most important reason people chose Rogue Legacy is:
Rogue Legacy has an interesting mechanic where each play-through is with a new descendant from the previous character, and they each have various traits and disabilities they inherit that effect how they play.
Specs
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Pros
Pro Endless procedural generation
This game procedurally generates almost everything. Your spaceships are procedurally generated, so are the planets, moons, every animal on these planets, the resource nodes, trade routes, languages, etc. When discovering new species or planets, players get to rename these and leave their mark on the galaxy.
Pro Good graphics
The art style of this game is very colorful and saturated and uses hues in a way that it gives you an otherworldly feel. Graphics like these tend to remain good for a much longer time than classic 3D graphics.
Pro Massive galaxy to explore
Thanks to the fact that the entire galaxy of No Man's Sky is procedurally generated, the amount of planets to explore is almost endless. The number of planets would be 18,446,744,073,709,551,616. However, the fact that 2 players managed to find each other in game on the first day, seems to make this number quite questionable.
Pro Seamless space to planetary flight
Pro Freedom to choose how you want to play
Ally with factions, trade or just be a pirate. When trading with NPC aliens, you build up a positive reputation with the faction they belong to. Alternatively you can also be hostile and attack trade ships, or even be attacked by NPC pirate spaceships. Both can be ways to get what you need, so do whatever suits your play style.
Pro Lineage affects gameplay in an interesting way
Rogue Legacy has an interesting mechanic where each play-through is with a new descendant from the previous character, and they each have various traits and disabilities they inherit that effect how they play.
Pro Tons of replayability through procedurally generated levels
Rogue Legacy has procedurally generated levels, which means every time a player restarts the game it will be a different experience that plays out making for a ton of replayability.
Pro You don't lose purchased loot
The upgrade system in Rogue Legacy works by spending the money you gained in the last level (you lose all your money when you start a new one), with upgrades passing down through generations by being either upgrades to the family manor, or family heirlooms. This way even when the player dies (which happens a lot) the player will not loose their purchased items allowing them to continue without starting completely over.
Pro Lots of upgrades to buy
The upgrade system in Rogue Legacy works by spending the money you gained in the last level (you lose all your money when you start a new one), with upgrades passing down through generations by being either upgrades to the family manor, or family heirlooms.
Cons
Con No clearly defined missions
The objective of the game is to ultimately reach the center of the galaxy. However, the player is completely free and unguided from the beginning. You figure it out for yourself as you start mining, crafting and upgrading your ship and gear. This game doesn't have a big story to tell.
Con Expensive
No Man's Sky is a pretty big production for an indie game as the team of devs and artists consisted of 14 people in the later stages of development. The game stands out above most indie games in size, features, technology and graphics. Along with the amount of enthusiasm from the gaming community, this has allowed the studio to set the launch price at $60 (or €60).
Con Repetitive gameplay
Upgraded monsters are just palette shifts of old monsters that throw more projectiles. Even with the upgrade tree and armor/runes, the game always feels the same.