The best music I've heard yet! I love that there is a jukebox section, all games need that! The title screen and background art is really impressive! I found the controls don't feel very natural, not much control of jump height and movement in the air is slippery, gravity is also very low while falling. The enemies kill you in one hit, and it seems like there is even a gap between the player and the enemy when I die which is frustrating. But I still enjoyed it! The music tempo and the huge jump height make it feel like a very fast paced game, but the lack of contrast in the artwork makes playing it on a Game Boy DMG very frustrating, the ghosting pixels blur and hide the spikes and the diamonds.
But this is all very high level critiques, the game runs buttery smooth and is a lot of fun, awesome game!