I like the game concept and the controls are nice. I like the idea to move things around with this bouncy little friend on the string. It also feels super smooth! The level size feels right and the timer isn't frustrating but still gives a deadline feeling - well balanced!
I think the visuals are funny and adding to the vibe but I feel like they could be upgraded a bit if you decide to keep working on this (which I think you should because it's a super fun concept to play!). And the visuals of the placeable objects (stair, ladder, platform) already seem polished to me for a minimalist style.
The audio is nice but the loop could be a little longer, I kind of notice it repeating.
Honestly, for the amount of time you've had and resources this is already great fun to play! I'd play it again if you have more levels.