I had to find my old, dusty mouse for this =)
Interesting to see what you did with the grapple mechanic. I really love that I can do the full loop with enough momentum in your game. I tried to make this possible in my entry, but didn't succeed, unfortunately.
I also like the dynamic between rolling and swinging. What about making a larger level, where you could really gain speed first and then lift of with the grapple hook?
Enjoyed playing your game a lot!