It was a very fun game to play, feels very complete. The idea to have a growing centipede (or whatever Yulper is) as a platformer character is really great, one of those "why hasn't this been done before and if has, why haven't I known about it?" kind of ideas. It takes some elements from Super Mario Bros. in the visuals, but I think the music is a bit more newer style, which is nice, I guess. Unlike many old games, this game starts easy and the difficulty picks up slowly. I lost my first life on the fourth level and that was because I fell into a lava pit. The level editor is another great feature of this game.
I'd be glad to invite this game to our contest, the Game Development World Championship!