Great game! The gameplay is fun and a bit unpredictable, and new gimmicks every few stages really help keep it fresh. I'm sure people already gave you more than enough suggestions, so I don't think I have anything new in that regard. A small thing that was a tiny bit uncomfortable was rapid flickering of chuckles in 4-5. I do not experience photosensitive epilepsy, but rapidly flashing colors are still uncomfortable.
Overall, a fun game that everyone should try.