Cool game!, Pretty original to me.
I didn't need the tutorial to do it so it has potentail to make a good textless tutorial, maybe if you could communicate to the player that you can use the right click in order to go between worlds and more basic levels in order to introduce the mechanics, like just one level to tell the player that this cube can interact with buttons and the other cannot. But other than that and if you decide to further develop the game, a bit of polishing here and there like the players movement and the graphics could make the game even better. Pretty good game.