Dude that's cool game, keep it up, you're doing a good job.
The only thing I would like to note is movement and shooting.
Sometimes the character gets stuck between a platform and a floor, making it impossible to get out unless you start shooting at yourself
Shooting sometimes behaves strangely, in theory everything should have hit from the shotgun, but the damage is small. I don’t know, maybe I’m not very accurate.
Sorry for bad english, I'm from Russia.