Gameplay is functional but is a bit difficult - it can be hard to both jump over mines and aim the mouse at the same time. I do like that jumping and shooting is tied to the music's rhythm. Aiming seems like it needs to be precisely on the target to work - maybe increase the size of the crosshair a bit? Aside from that, graphics look nice and make good use of the 64x64 space. I really dig the colors in the background. The music is pretty good too!