These notes are from 1.0. (Dunno if there's been an update)
Hold left+right+down and swing sword for more strange animation.
The key keeps respawning in the underwater area. Collect it. Reload map. Collect it again.
Still possible to escape the map by crouching and running. Ending up deleting my save file with New Game, so had to load my totally sweet edited save to get these screenshots.
1. After puzzle piece in hidden cave, there's an arrow shooting dude. Kill him, and you can glitch through the wall where he was standing.

2.

Also, if you enter the area in the above screenshot from the right, the moving platform doesn't come.