I guess that there are so much space for tinkering physics actually. The collision detection code is... well, it's alright, but it is so much forgiving on player mistakes when it gets to colliding enemies. The SFX might get kinda pressuring, but I wasn't sure if default settings were comfortable, cause it depends on your system audio (like, you know, I never have 100% volume on mine).
Anyway, thanks for the review and good luck with your entry!