Just played through all 12 levels and it was a lot of fun! I could see this being a really great mobile game. I came in a bit over par but I want to go through again and get a better score.
If I had to make one suggestion, because there were a couple levels where you couldn't see what was off screen, it might be nice for each level to start zoomed out so you get an overview, or have a way to move the camera around and preview the level.
I think your levels were designed in a way that seeing everything wasn't required, but if the levels started to get longer it could be a nice feature.