Controls were a little wonky for me - not super responsive, the character would just kick away the gun before I could grab it on the second level, and then because the character only scrolls up the wall when you hit it, I could only get the gun by being very careful, and then I was surrounded by enemies.
The enemies we super aggro, meaning you had little time to get your bearings, and if you got hit, it was most likely by 3 or 4 at a time and your whole life bar was gone. Adding some I-Frames would have been a good idea on getting hit, Or finding a way to let your player not stay in trouble. Too many times getting trapped in a corner made the game very frustrating.
Guns fired a little slow too, Having a gun that fires slow is good, if it kills quickly, or knocks back consistently, but it didn't feel like they did for how slow they shot.
Good little game, needed some more attention paid to the mechanics. Play testing is important.