Super fun little game. I got the "proper" ending (A) first, then E and B on my own, and finally with a hint from the comments got C and D. Really fun, good story telling, lots of interesting characters, the world feels "alive" despite the somewhat meta understanding many characters have, a few red herrings to make you question yourself (at least I think they're red herrings, unless there's a secret 6th ending xD).
One suggestion I'd give, because of how similar you have to start to reach most of the endings, would be to add a way to go back to certain checkpoints. Like immediately after getting the multi-jump power-up or after collecting the wood. It was a little tedious to do basically the whole story over multiple times, especially considering how much dialog is involved (good dialog, just tedious the 5th time you're doing it).