i LOVE the concept of a castle/jail on wheels. The concept seems a lot of fun. But it's limited by having no place to make a mistake. In the first part of the level if you don't get all the wrenches you are stuck in game. I think this is quite harsh because the player is barely a minute into the game. Maybe give the castle a bit of gas or a jump mechanic to at least get a chance to try it again.
Apart from that, I think the mechanic is cool!! And am curious how the inside of a jail on wheels looks like.