Arrow keys or WAD to move, R or P to restart, space to update cloud highscore.
Yes, I know it's hard. Yes, @scratch_cat3 I know that level 4 used to be harder and there used to not be a checkpoint on level 3, but I decided that it would be like that. If you don't like my game design decisions, remix it and change them. It's not that hard. Make the list named "Checkpoint Levels" not have 3 or 6 in it, and make the opening for the jump on level 4 smaller.