Pretty good for your first game, I like the graphics and the music is pretty funny too, here's some pointers:
- The UI could have some more work done to it, the text is quite hard to read
- The hitboxes are a bit too unforgiving, it's very difficult and sometimes you get hit when it feels like you shouldn't (I didnt get to the first boss after a long time of trying heh)
- More damage to your projectile, felt like it had very low in damage