Overgravity is a 2D multi-player space themed shooter.
The main feature that distinguishes it from other shooters is the speed of the gameplay, not to mention the dozens of weapons and powerups.
There are also six single-player modes which can be highly customized.

Single-player:
Normal mode
Unstable mode (the map change during the match)
Coins mode (every damage generate a coins explosion, who has the most coins wins)
Vampire mode
Capture the flag
8 different Tournaments

Multi-player:
Normal match
Team deathmatch