The mechanics are there. The biggest thing for me was the scoring. I had trouble figuring out exactly when triggered the score. Did it need to collide the top of the block? With the line? Right on the beat?
Timing on these styles of game is always the most challenging part (just my opinion, of course).
I definitely understand the time restraint. (Truthfully, I'm not satisfied with my entry either.) But good job for submitting anyways. You've done a pretty good job with the time given. Would love to see you keep going with this and push the concept until you ARE happy with it.