Really cool mechanic with a great art style and music. I think my only big complaint with it is that it doesn't seem to really teach you exactly what the different forms do. I'm not entirely sure if I understand at the end what the benefit of one of the forms even is. Dedicating a room to learning the basics of each form would go a long way.
Thanks! We tried to use in-game stuff as the tutorial. The baby starts under the table, so you know he can fit in tight places. During the portion where you can see enemies under the floor, you should need to turn from adult into the old man on your way back into a baby, so you can see the enemies do not follow you when you are old. The adult doesn't really have anything other than speed going for him, both him and the old man can climb on stuff.