Hi, I like shooters so I have a lot of feedback to give.
So, the fun in shooters is shooting a thing or things in order to accomplish a goal, usually damaging and killing enemies. In this game, there was like 5-ish seconds of downtime between shooting to kill the things. This isn't always bad if you have another goal that's fun. But, the only other goal was to avoid extremely slow moving enemies for the sake of maybe hitting them to kill them. This meant I could press a movement key to step slightly out of the way of an enemy and wait a few more seconds. Shoot. Rinse and repeat.
Each wave took me 1-5 minutes of slowly avoiding enemies just to maybe hit them with a shot after 5-ish seconds of waiting for the cooldown to end. The movement and guns were all responsive. They were all fun. It just took way too long to shoot with the long cooldown and I had no reason to move around a bunch because the enemies were so slow.
I know the theme was "out of control", but I think the cooldown being so long really hurt the experience for me. The gunplay and movement were both fun, I just wish I had the chance and reason to do both more. I think with a little more polish and focus on what makes the game fun, this could be a lot more fun.