Incredible amount of content! I had a ton of fun playing through the game and made use of every single tower.
I had two freezes on the web version. These lasted ~45 seconds and made me think I would have to replay the entire game. One occurred during dialogue and the other during Stage 9.
My fingers hurt after the mallet stage. Since mallet speed seems to be limited, I wonder if its mathematically possible to beat the stage mallet only. I get that the intent is to use the towers to help out, but it would be fun to think about. I also noticed some sort of limiter on the rate you can skip through dialogue.