Well done on your game! It worked well and the controls were very intuitive!
What I noticed is that I developed a bit of a flawed strategy (on easy mode). Instead of playing the game the "intended way" I would just go for easy points instead. Since the game is quite leinient, this doesnt cause any problems. Maybe more incentive (bonuses, unlocking better equipment, combos) could drive players more to the intended (and probably more fun) playstyle.
Overall its a well polished entry though, great work!