Funn, I enjoyed the different guns, Jerry was my fave.
- Windowed mode and volume options would be appreciated.
- Gameplay was mostly clear from playing, but controls were not obvious, took me a while to work out how to switch weapons and that you could move.
- There's no back button on the custom difficulty settings page.
- I couldn't tell which way the on/off icons in the custom settings meant, I played a round with them all disabled by mistake and it started glitching out.
- The gun sprites and menu backgrounds are good but the dark blue background when fighting is a bit too much to look at, and camoflagues some enemies a bit.
- Enterring neagtive numbers was a bit unintuitive, pressing the minus character seemed to toggle between negative and positive numbers, and I couldn't backspace out of it if I wanted to change it, which took a while to figure out.
- There were a few times there was 1 enemy left I couldn't find.
I like doing the calculations and the shooting individually, but trying to do both at the same time was a bit much, like for me it's too much using wasd, typing in numbers and using the mouse to shoot at the same time. A change in pacing might be nice, e.g. if the enemies were slower or spawned slower, or if there were dedicated segments to do the calculations inbetween bursts of fighting. Probably a whole bunch of ways you could change things up there.