There’s some nice exploration to be had here, even if it’s apparently a matter of luck whether you reach the end in minutes or never find it at all! A lot of the fun is lost to jumping/falling into enemies, though—especially those spinning spike things, which seem able to hit you several times.
There are other little glitches that would be easily overlooked if the exploration felt more consistent. (The animations stutter a lot. The graphics vary wildly; the player character looks great, but the clouds, not so much… and I’m not even sure why they’re there. The sound effects often seem to have no connection to what’s happening in the game.)