Thank you very much and I'm glad you enjoyed it.
Space would be an option, but the keybind was copied mainly from Hollow Knight. And I think Ori and the blind forest also used Y/Z for jumping. But that game was not really designed for keyboard, but for a gamepad. So if you have one that makes the game even better.
Ok, you didn't get the joke with the name. The theme for this jam is "The game is a liar" and this is one of the times the game lies to you :D Your name does not really matter at all, because it is never used again in the game.