A fun beginning. I especially liked the fish-eye effect for part 2!
The art reminded me strangely of old gameboy games, but with more pixels haha.
I would see more mechanics linked to the upgrades, like some enemies you cannot kill if you don't have the range.
Three points, to say I made a useful comment:
- I really like the possibility of going back to Menu or quitting the game properly, so imo it would really be cool to add those buttons somewhere :)
- It would be better to have something saying you player was hit, like a sound, a knock-back, having the sprite twinkling... something.
- At the end screen, saying to be continued, you can still move on the back, or at least shoot. And sometimes you can trigger the end screen animation again, which leads to have both texts on top of each other. I don't know if you knew about that :)
Well done :)