I'm not sure if it's my skill or if I'm doing something wrong, but I can't seem to jump when pressing the spacebar.
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You gotta unlock jump after collection enough stars. If that sill doesn't work, you might have hit the delete key on the keyboard, which was a debug key for clearing all the abilities. You'd have to reset data from the menu and play again, since that data is persistent. Or press the insert key to grant all abilities (debug hack)