Good concept! The intro sequence was really good and got me hyped up for the game.
The overall game feel was really nice, I like all the visual and sound effects. The music was also good and fit the theme really well.
If I had to give some feedback:
-It would be nice if the enemies had an indicator showing when and were they were going to jump (so they are easier to avoid)
-If you expand on the game adding some other weapons could make for some interesting levels
Good Job!