Fun—but at what cost? The answer is: your finger!
I really enjoyed the feeling of pushing yourself to beat the game. Instead of memorizing techniques or patterns, all you have to do is click as fast as you can, and that makes for a fun kind of challenge.
I think I would enjoy it even more if the keyboard could also be used for clicking—after all, ten fingers are better than one! I'd also love to see stronger power-ups. During my playthrough, I often felt stuck in a loop: I couldn't click fast enough, so I didn't have enough time to buy power-ups, which meant I had even less time to progress.
Overall, it was a fun experience. Good job! The wizard laugh is gold!