Good game. Boss is very very hard. I eventually beat it by cheating. If you hold down jump, you wont bounce off blue gears or the boss, so I stood on the bosses head and dealt infinite damage to him, then jumped off after he died.

That was fun and nice lvl design! I've enjoyed playing it until one point.. i stopped playing when i finally managed to pass all the blue gears and slide under the door with speed and there was a hole in the end of the wall, above the yellow square. I felt a bit "robbed" of my win there... other than that it's a really nice runner, cool job htmlstudio :)