Pros:
It's very fun and entertaining, in my opinion. I've played through 10+ times now, and I love the level design. Especially level 4 and level 6. ;) The sound effects and music were, I didn't like two of the sound effects, but I'll get to it later.
Cons/Recommendations:
I didn't like the sound effect of collection coins, it sounds like it's a sound effect ripped directly from the Windows OS, in my opinion it would be better if it was ripped from Mario or something similar rather than what I believe is a Windows Sound effect.
There's quite a few glitches, some just seem to be a completely random occurance, and a rare one at that, but one major one I noticed is on level 4 and every level afterwards I believe, you seem to become invincible, you can still die, but you can die over-and-over again, not just 3.