It took me several attempts to figure out the character was jumping, mostly because he doesn't move up any during the jump. Because of that I gave the game a rather low score on the graphics. I don't think the game looks bad, by any means, but when a control feedback to the player isn't immediately clear I have to consider that a failure in visual clarity. 

Once I learned  that I was actually jumping, I picked up the game pretty quickly, but didn't make it to far into it before I lost interest. It's not a bad game, but I personally don't find timed based jumpers to be fun. But for the sake of objectivity, I think people who are into timed based jumpers would enjoy this kind of game. However, I'm not sure how rhythm plays into this game, which I assumed it would given the title.

The music was okay, I only heard the one track so i'm not sure if it changes the more you play or not. 

Also, the opening of the game has some typing in text, and it goes off the screen until it finishes its cut scene. Not sure if that's intentional.

Overall, I think it's a nice game.

I really like the graphics and music but I wish the gameplay didn't include shooting and was instead about jumping, sliding under obstacles  (held notes that are longer) and stopping to avoid falling debris or something (short pauses in music). As mrmatt said, it's pretty dang difficult to be looking both at the ground and aim your mouse at the same time, especially at the scale we're talking here. Or maybe I just suck at these kinds of things (I do).

If you get a chance, please check out my entry.

I don't know if it's just a client side problem, but for me, the game actually started with 64x64 pixels(really small). The gameplay was challenging but good, with everything feeling nice and tied-together. The art and music is also great. If you work on this post-jam, it can turn out to be quite a good rythmic shooter especially on mobile phones.

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!