Thanks!
Though I feel like the artwork has been straying too far from the MS Paint look.
I'm wondering this too, since I'm new to itch.io and also game jams in general.
Originally on dekstop you can press space to shoot, but there is a bug where you can't shoot when pressing up and left at the same time. I'll try to fix that.
I started making the game three days before deadline, so I have very little time to do anything.
Maybe I could add some mini-boss enemies at the end of each wave to make it more challenging.
For now I'm more focused on refining controls and collision detection.