Great game!
I like how you dealt with the limitation. And its cool that after a while the ice breaks underneath them, the fact that the hole stays. The difficulty increases really nicely, but it lets you bounce back pretty easily, which is awesome. And the art is nice too. The game needs some music and sound effects, though.
I also made a game that has penguins and uses that kind ofy, so that was a funny coincidence lol.