Very good pixel art, the sprites look fantastic! The palette is perfect, and really makes everything pop, particularly with the white outlines.
Some levels were tricky, but this works very well with the short levels and very fast respawn times, which prevent the game from getting frustrating. The death counter was a nice touch too
I did encounter some issues with jittering and screen tears, and a health bar for the final boss would be great as I wasn't sure if I was doing, but otherwise really enjoyed this :)