I really like this idea and haven't seen something like it before.
I did find it quite buggy though. Holding down the middle mouse button to clear tiles kept putting tiles back in places I didn't want them and I can't remove the darker tiles, that might be intentional though I'm not sure haha.
I also found there to be quite a lot of controls to mentally take in straight away. That's not necessarily a bad thing but for a game jam where we don't really have time to put in proper tutorials and stuff it can be hard to grasp all the info.
I think it might be cool to explore even removing the platforming element entirely and focus purely on it being a puzzle blueprint placing game where you're some renovation ghost or something so you just fly around where the mouse goes which auto pans the camera, allowing the player to focus purely on the puzzle side.
I know time is super limited in a game jam but I just feel like it's better to receive at least some kind of constructive criticism on what could be better as I personally find that useful, so I hope it's not taken the wrong way at all haha :)