I love the old-school 8-bit platformer aesthetic you created, both visually and aurally, that works wonderfully for your concept, and it is a good concept to make the main character completely dependent on you, the player being the assistant.
Sadly the player controls have some glaring flaws. Pieguy seems to have no trouble jumping over obstacles once prompted to do so, but Limeguy freezes if he so much as touches an obstacle mid-jump, which especially becomes problematic if Pieguy moves far enough away that Limeguy is off-screen; while it's likely that Pieguy will die anyways if he got that far away, it certainly feels like the player isn't given a chance to recover, a chance players will at least want to feel.
While I used Limeguy's momentum to help get ahead of Pieguy just in time to make him jump, that same momentum makes it hard to precisely jump to stomp on enemies before Pieguy hits them. Limeguy either needs tighter air-controls, or Pieguy may need to be slightly more independent.
Lastly, while yes you included instructions in the description, it's generally good design practice to have instructions accessible in your game, either from the main menu, or via a pause menu if you've room to include one (which the free version doesn't leave a lot of I'll admit).
From a more experienced developer or someone with access to more than what the free version of Construct 3 offers these gameplay errors would be inexcusable. But I am aware of those limitations and would like to reassure you, your concept is great, but if you pursue this project further I strongly encourage you to take a look at anything you can do to improve on this.
Good luck in the Game Jam!