Speedrunning this game is pretty straightforward overall. No one has discovered any significant skips that allow you to access late-game content much earlier than intended. All you need to do is play all 12 minigames as fast as possible. Included below is a google doc that contains tips and tricks for each of the minigames.

https://docs.google.com/document/d/1MKLwjT4GE1uKFF6lWUlYgpyp0fRvpj_Ctle51fmnYrw/edit?usp=sharing