I'm a fan of these interesting movement mechanics. I really like how you have the course of the boomerang displayed. It's certainly cool and has potential.
There were a few things that really confused me, though. What is the failstate exactly? It felt like sometimes, my boomerang would hit something and just go back a little bit. Sometimes it would go all the way back to the aussie. If it flew over a pit, that was a fail, which I don't understand why. It also felt more like I was just grinding the boomerang forward one step at a time. The fact that the boomerang kind of "hovers" at random points is also unexpected. When I think of throwing a boomerang, and with these cool movement mechanics, I imagine myself lining up and making a sweet ass shot that curves around some obstacles, gets the gems, and then safely makes it back to me. The step-by-step movement had me feeling more like I was just shuffling an unwieldy little vehicle through a maze than throwing a boomerang.
Something wasn't quite clicking for me. I wasn't really seeing the "right" thing to do aside from blunder forth. You have a great mechanic, I think it just needs a bit better messaging.