I really like the idea. I think the levels are a great way to introduce the different tiles to the player. But I feel like the last level is way too fast. It's either pure chaos and you lose without knowing what's going on or you get a nice pattern and it's way too easy. I think making it slower would put more emphasis on the decision making when choosing between the different tiles. This way I basically just pointed upwards in the direction with the most grains.