For some criticism, I think the thing that stood out the most for me is that there is a seemingly random delay between when you shoot and the gun actually fires.
That is the gun raising from the resting/carry position. You can hold right mouse button to move while aiming which removes that delay 😉That also puts you in walk mode instead of sprinting. It's like having to transition from sprinting to aiming through a scope or whatever in first person shooters. That aiming mode is mentioned in the instructions.
You can also use the abilities with 1-3 but yeah they are a bit tricky to use. Originally I wanted to make it playable with a gamepad but didn't have time to fully finish that. Maybe the controls are more suited to a gamepad and just tricky with mouse and keyboard.
I also thought about enemies blending too much into the background and thought about making the weapon or eyes glow or putting them in a more visible space suit. They can also attack surprisingly from offscreen. You have time to dodge all bullets though so it didn't seem that important. All the ranges and such are a tricky thing to balance. Maybe I would have found a better balance with more playtesting.