Control were a little confusing at first but once I got it they felt pretty smooth. I agree with thiscris the dash is really satisfying, I love how the enemies split apart, and you can cut through them multiple times. I like the leaderboard too!
Out of curiosity, you said it took you 30 hours, is that the actual amount time you spent working on it or the total time from start to finish? AFAIK you only need to count the time you spent actually making the code, art, and sounds. 30 hours sounds pretty high to me but i don't know how long it takes to implement a leaderboard either so i just thought i'd ask.
Overall really fun game!