once you get the drill, you can use the drill's ability to snap you to the grid to jump 4 blocks in height, sorta like the quick-turn in pac-man speedruns.
(with how many 4 block tall things there are in Ziggurat, this might be intentional?)
also it's possible to softlock by switching off blue, entering the main menu, leaving the menu with the player's position in the center of the A, then when you come back with blue switched on again you'll be stuck in the A without ctrl+Z doing anything. (since it doesn't undo level entering)