I see the potential in the game mechanics, however I found the levels pretty difficult and the string mechanic to be a bit frustrating to use because it wasn't dragging along the characters the way I expected it to.
Especially the first level, I find it a bit too difficult for a first level. A lot of the jumps in the first level make you rely on coyote time for the cat character which imo shouldn't be a thing in the first level. The first level should be introducing you to the basics of the movement and the mechanics. While you did do that, I think it shouldn't be this difficult. Also, in the first level after you pass the first 2 switches, you can get stuck if the bunny make the jump (unless you do a double jump and hug the wall to touch the edge tile so it resets your jump).
Also, a lot of the buttons were located at pretty frustrating places (Beginning of second level for example). It felt as though you really had to be precise with the placement of each character so you can activate both buttons at the same time. You should give some leeway.
I do really love the ideas you had for some of the levels (level 3 especially), but I think you should tone down the difficulty a little bit.
The art and sound design is really awesome I really enjoyed looking at each level!
Otherwise, I really like the gameplay idea and I do see the potential in it with some tweaking to the difficulty, string physics, and movement. Great job!!