This game went hard for me. When you start playing it you need to read instructions but also you have to react to the game process, but you can't because you don't understand what to do. Maybe a solution here is to give some time to figure out the game process before the game starts.
The mechanic is good, but sometimes enemies spawn too close to the player, and because of it you don't have enough time to rotate and shoot.
I think that's a good start, a little bit of polishing and the game will be much better.
Anyway, I hope you had fun during development!