Very cute! I really liked the mechanic of switching back and forth between the two characters, and I got excited when I discovered I could lift and throw my friend. I liked how that mechanic wasn't explicitly explained!
My main feedback is on the choice of controls - I kept wanting to use Tab to swap between characters, since I'm used to Alt+Tab (Or Cmd+Tab on MacOS) as a shortcut for switching between windows. So "Tab" means "switch" in my muscle memory, and as a result I unintentionally reset the level quite a few times, which was a bit frustrating.
Also - the platforms had what felt like a small "slope" near their edges, such that if I got too close, I would lose grip and slide off the platform. (Or, maybe the character's hitbox is a sphere?). This led to me slipping and falling a few times when trying to set up precise jumps. It felt like the visual cue of where the platform ended was a little inaccurate/misleading.
Anyway - great work! Nitpicks aside, I liked it a lot.