Hello.
This game realllllllly needs a way to restart the level without needing to reload the game page. Let's take level one. I accidentally let high-jump character fall on the next level pit, now I need to restart the whole game ( in this case, no other levels had to be redone ). On level 2, for example, I accidentally let big rock fall with the place that the wizard is, now to try again I'd have to redo the other level. Getting soft locked made me not want to try again.
Furthermore, a tutorial is necessary, as I only found out by a comment that shift makes the character run.
As I already said, getting soft locked made me not want to try again, so I did not finish your game.