@vehem: Thanks for the feedback! You are correct, the night vision doesn't do much after a few upgrades - I thought about just hiding the button after 2 or 3 steps because there's no point in upgrading it anymore. Increasing the light range would make sense though! The energy depletion rate is already handled by the "energy" upgrade.
We might do some small additions/fixes to the game afterwards but probably nothing major because all of us are going to be quite busy with other projects soon.
@wesxdz: Thanks! Yes, having more enemy types is probably on top of the "to-do" list.
@eximarus: That's actually something I was supposed to work on but kinda forgot / ran out of time to fix. You probably noticed that you can keep the mouse button pressed to shoot so the accidental clicks on the upgrade buttons should be somewhat eliminated.
@quemagalletas: Thanks! Yeah, some sort of visual cue for taking damage should definitely be there.
@thorneto: Haha, glad you found the flashlight because it's such a crucial mechanic to the game. I'm not sure what you mean by a visible cursor? There should be a cursor on the web version too.
**For the rest: Thanks for all the positive feedback and for the constructive criticism!**