Cosmic Rays

Cosmic Rays is a 2D platformer where you jump and shoot enemies, and use the enemies you defeated to create new weapons and upgrades in order to save humanity from a hivemind of aliens attacking Earth. Or maybe, you will find out something about those you work for which will make you betray humanity.

The full game is $4.99
But there is also a free demo available to test and see if you like the game before buying

Inspired by the classic Mega Man series of games.