As some other people already mentioned, there are many ways of improving the game. For example, I really liked how satisfying it was to blow up multiple enemies at once when I was surrounded. However, once you move away from them, you start destroying only one of them at a time again. Adding some abilities to escape being surrounded by multiple enemies and killing more of them would really improve the game.
But overall, had a fun time playing it, I can see myself playing it more. I was worried that it would be hard to play with only touchpad, but the lack of mouse wasn't too noticeable, so good job! Visuals are on point, and sound is simple yet effective!