Nice Game! Though I think it needs a bit more polish, since some values like the camera shake in the rocket launcher is way too overdone and the default settings are just not playable. Another thing is that you don't really have time to react when entering a room, as the enemies instantly attack you, which in return can make some rooms just impossible to beat.
Also it was kind of unclear when the weapons changed and the movement was in my opinion way too floaty and maybe you can do some custom UI sprites next time, these tend to look generally better than the default UI.
But still, this is a solid game! I've had lots of fun while playing it and some of my points are just my personal opinion ;)