Well, with these rules the level will be extremely linear with a random layout, how are you supposed to make a layout if you can only have two "exits" from the blocks, if it were like that you would either have a lot of dead ends, have just a level that's basically a large circle, or have a level like a large tunnel that twists around that has two dead ends at the end. I think that if this were to succeed you would need to alter the rules abit and perhaps have a layout already made so it doesn't end up a random mess.