This was a nice game!
Some thoughts:
- The fire rate in the beginning was a bit slow, which made combat a bit jarring. I think if the fire rate started at 0.3 seconds, it'd be better.
- The reflect ability detects bullets too late most of the time. If the shield reflected the moment the button was pressed, reflecting would feel way more responsive.
- I really liked the overall aesthetic of the game! The pixel art is nice, and the fact that you utilized the Gameboy palette so well is impressive.
- The enemy variety was also pretty nice! I have no idea how to make bullet patterns, so seeing someone pull it off in Godot is mind-boggling for some reason.
Overall, it was pretty fun, even with its issues. Good work :D