Hello, thanks for your detailed review!
I could make it so that you hold down the right mouse and it automatically fires the secondary attack as soon as the cooldown is over. I think the experience is pretty similar on controller since you have to press down the left joystick each time.
The difficulty was one of the things I was unsure about since it becomes harder or easier depending on the level of characters, how many you keep alive, etc, so I can see how it would either be quite easy or very difficult.
I was considering something like screenshake on hit but I was concerned that it would make things a bit disorientating with dodging the bullets after. Arrows to fallen comrades also sounds like a good visual aid.
For the UI, it was more of a stylistic choice to make a parody of Japanese game UI with lots of different elements throughout the screen, but I'll definitely adjust the war room a bit to make it less confusing which mission you have selected.
I hope you enjoy the rest of the game! I'll try to fix the crash for now, and if you do leave any other feedback, I'll put out a v1.1 with some more improvements.
(edit: I put up a new build which hopefully fixes what I think might be causing the crash, and I did make a quick fix to the war room selection too)