Lovely game! I already really liked Doormat from you, and you haven't disappointed with your gmtk's entry. The concept is great, the puzzles are simple but fun, and it's super satisfying to hit that speed up button and see all the sound effects and cubes move in a cute way.
Also the secret level was very neat, an awesome iteration of the concept. Lastly it's incredible that you managed to make all these levels in time for the game jam! Genuinely a lot of content for the time frame we had. I continue to wish you the best on your game dev journey