Awesome idea! Here are some thoughts I had while playing:
- The bounce sound is very jarring, maybe toning it down or switching it to something else, and some music would be nice :)
- Showing an outline of the shape before placing. So you know the scale and where it would be in relation to the mouse.
Anyways I'm sure you would've added that with more time! I think this has some great potential and I absolutely love the idea!!! Good job!