When comparing Natural Selection 2 vs Spelunky, the Slant community recommends Spelunky for most people. In the question“What are the best team-based games on Steam?” Spelunky is ranked 13th while Natural Selection 2 is ranked 21st. The most important reason people chose Spelunky is:
Spelunky features 4 player local co-op where players share the same screen, which can get a bit hectic.
Specs
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Pros
Pro Linux support
Natural Selection 2 has full Linux support.
Pro Integrates RTS elements on top of a shooter
The game has two completely different factions - the humans and an alien race called Kharaa. One player in each team can become a Commander, who then issues orders, RTS-style.
Pro The 2 sides have vastly different strategy and playstyles
Pro In-depth choice of equipment
There is a wide range of weapons for each side that allows for plenty of choice for the player.
Pro Teamwork is essential
To really advance and do well in the game teamwork is essential.
Pro Kharaa can evolve into 5, highly distinct classes
There are 5 different classes that the Kharaa can evolve into.
Pro Developed to be heavily modifiable
By utilizing LUA files the game is highly moddable.
Pro Community driven development
From the very beginning NS2 has had a very passionate community - they've contributed maps, designs and even core features (such as the Spectator Mode). And since build 265, the game's development has been handed off completely to a 14-man community development team (with oversight from UWE).
Pro Dynamic environments
During play levels will change and react, making for dynamic levels and environments.
Pro Up to 4 player local co-op
Spelunky features 4 player local co-op where players share the same screen, which can get a bit hectic.
Pro Provides an interesting challenge by heavily relying on increasing your skill
Spelunky gives the player everything needed to succeed from the start so it is only when the players skills get better will they advance.
Pro Quick sessions so you can play in short bursts
Being that Spelunky is at its heart a roguelike the gameplay sessions can tend to be quick as the player will die quite often. This makes for something that can be played in quick bursts throughout the day. The convenient saving also lends to this as a game that is still ongoing can be quickly saved in order to be picked up at a later time.
Pro Expanded gameplay through mods to improve replayability
Ranging from Mega Man to Metroid, there are a tone of great mods for Spelunky all of which make for a new experience in the game which vastly expands the replayability.
Cons
Con Learning curve
The learning curve for Natural Selection 2 feels unapproachable at times.
Con Really long loading
10 minute loading times to join matches is way too long to wait.
Con Co-op is boring and confusing
In co-op this game is very confusing with little instruction on how to play. With little to spice up the game play, it gets boring quickly.
Con Difficult to the point of frustration
Spelunky is pretty difficult and some could say abusive, but with practice and a desire for masochism the game can be mastered.