Free Chaos Domain game from Idiegala. Requires email address submission.
http://store.steampowered.com/app/287100/
Chaos Domain is a game about shooting bad people in the face. Apart from that, it is also a run and gun platformer, powered by Unreal Engine. The game is highly influenced by games from 8-bit and 16-bit era, including Contra/Probotector series, as well as titles like Abuse and Doom Troopers.
User reviews appear to be generally split between "awful" (the majority) and "yay old skool"…