Mechanics

=Version Differences

Old Version - Version 1.42.5 and earlier versions.
New Version - Version 1.42.6 and later versions.
In the new versions, all major glitches are fixed, requiring a major change in the route. In addition, new versions do not start you with the Mines key, requiring you to do the quest to obtain it. Using locks is significantly slower in new versions, and there are some minor balance changes across the game.

Movement

Running gives faster horizontal movement than jumping. Jumping gives faster horizontal movement than falling. Jumping gives faster vertical movement than climbing ladders. As such: don't jump when you can run, don't fall off platforms if you can jump off them, and jump up to ladders.
Whenever you get hit, you take a small hop backwards. Turning your back to the attacker one frame before impact can turn this into a forward hop, which barely loses any time compared to running. Alternatively, if you jump at an enemy and turn your back while in mid-air,