Wow... that took a really long time - but I've completed it! I got stuck on level 3, 7, 8, 10 and 16 for quite a bit. There probably should be checkpoints as it is annoying having to go through everything so many times (especially since a lot require you to just wait). Level 11 was pretty convincing. I liked level 14 spelling bee. The graphics are good and I like how the music has the ticking of a clock, although after the 1,000th try it is pretty annoying.
The ending is definitely the best part, nice cat.
Overall this was frustrating but good anyway, great work!
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Update :: I've made 3 extra tracks to play so that the music has a wider variety. I've also began implementing checkpoints every 5 levels. Thank you for the suggestion. (Here's the new music: https://sndup.net/8d88/20_full_new.ogg)