It's fairly simple but pretty fun, and the power ups all seem to have a situation where they're useful. I made it to 165 in normal and 41 in hard mode. The highscore is a bit broken though, the menu shows the normal highscore as the hard mode highscore, and the hard mode score doesn't reset so the highscore isn't correct.
I'm not really a fan of how the power-ups menu scrolls, and it seems a bit too sensitive to me. I would have preferred just a regular scroll bar. Some of the power-ups' explanation text is cut off at the end as well, though "Don't Wanna Do It" and "The Cloud Hater" text overflows they're boxes, and the ones that aren't cut off have a quotation mark at the end but not the beginning for some reason. I also think there might be a typo in the "Red Cloud" description, since it says "the rest is will" when I think it's meant to say "the rest will".
Additionally, I noticed that you can still click on the clouds after you lose, which continues increasing your score, and since the clouds don't disappear either you could potentially do this for infinite score given the right circumstances. Also, when I lost with the "Lightning" power up active it remained active for my next run.
Aside from these fairly minor things though, the game is very solid and well polished, and I quite enjoyed it.