Thanks for playing. Can I ask what your system specs/OS is? I made this game on a Toshiba Satellite C855 laptop from 2013 that has no GPU, 4 GBs of RAM, and an Intel Pentium 2020 processor. Despite that, the game plays at a stable 60 FPS on level 1 and 2.
I'll see if I can have a setting to turn off the FPS capping, but I think that's just how Game Maker handles all games made in it.
I realize how much the visibility is a problem now, I'm going to fix that ASAP along with a patch to fix the resolution. Healing would definitely be nice, I'll have repair kits available along with the ammo drops. Not sure why the single clicks don't register, are you using the minigun weapon?
Will add some screenshots too. Thank you very much for this feedback, it's extremely valuable.