It's a fun game when you get the hand of it! The biggest issue for me was that you can't see the ice when it is close to the screen, so I thought some levels were impossible until I realized I just couldn't see them. I didn't understand what the black things were? Either they'd really mess up with my movement or I'd go right through them.
I'm sure it would've been even more fun with a friend, nice work :)
(sorry if you got multiple notifications, it sent 3 times for some reason but I deleted them)