Painkiller - an endless shooter inside the human anatomy

A work in progress for an endless shooter game :)

What is on the horizon:

•  Rogue-like (rogue-lite) upgrades in-game, when selecting a path.
• Greater variety of enemies/weapons/power-ups.
• In-game store for permanent upgrades (or upgrades from reaching a specific score)

I would be very glad if some people tested the game out and suggested some ideas!
Bug hunters are very welcome!