Wow! I really like the boomerang mechanic.
The game feels very well programmed!
I understand that this is like a sandbox game where you just jump in and have fun playing with the mechanics. But if you make some actual levels for this, that are not as "all over the place" as this level, then this could be a really great game!
Also, if I may ask a technical question: How did you make that bouncy feel in the options menu? I love it!