Oh, its not easy to understand how to play at the beggining, but its allright! I really liked how u interpretated jam limitation, it was fun to play. I think u should add more space for the player, decrease speed of enemies and make more clear tutorial. I think it should probably work. Also if u will add some HUD to the moment when u aiming with gun kinda crosshair or something like that - it will be less missunderstood.
Also art is interesting and for me really fun.
You did a great job! I will be glad if u play my game too <3