The other ending can be obtained after finding three flowers in the world. You probably saw one flower while exploring but the other two are somewhat more hidden.
Ah. I'll have to look for them then.
Also, (you probably know) you can get an infinite combo by jumping on a burger or crystal of the screen back onto it, and if you do it on the screen underneath the evil person, you can just kinda build up enough speed to clip through the pink light wall thing, and get stuck (if you forget about rewind, which I did)... Also the combo wraps around to 1 after reaching 99 which's neat.