You are correct! The tiles around the outside are randomized. The sprites represent what rooms are spawned and change position with the blueprint! We had an idea of adding Easter Eggs in the rooms around, but unfortunately ran short for time. The main path is the same only for the purpose of control. The idea was exactly as you suspected, we wanted to have it randomize all and always have a path available. We will get 'em next time, haha!
Thank you so much for your feedback and for playing our game! We are glad you enjoyed it!