Ah yes, the classic skinner box, the ol' clicker game! This game was pretty fun to play, I think my favorite part was listening to the music : D. I didn't expect the laugh either so I cracked up too when I was singing along. Fun game, cute sprites. I will and always love pixel art.
However, the clicking should be instantaneous and synchronous with the mochi animation. With player characters, or characters that you control directly, having animations immediately represent the player's input makes for a much more tighter feel of the animation and player's controls. Plus, if I'm going to be spamming the clicking animation, I want those mochi bunnies to be rapidly and hilariously switching sprites.
Other than that, the only thing would be the text color and it's background's color. The text color is kinda difficult to read against it's background. The pixel art would benefit from unified pixel scale but it doesn't really matter to me since this is a game jam and you make do with what assets you have :P so I understand.
I think the concept really shone through though. It was a functioning clicker game with hilarious animations and upgrades and audio too! The fixes I suggested are just tweaks and not inherent design flaws, or critiques of the stylistic choices, so I think you should still be proud of completing the jam! Good job!