Really cool game that honestly kinda resonated with me.
It reminded me of growing up messing around with my brother and that love you have for your siblings and how we would do anything for each other.
Music was really nice and the simplistic primitive shapes I think actually did it a favor as at least for me it made me think that sibling love is irrelevant of species, reality, or anything.
My only criticism is that the big brother just doesn't seem as useful as the little brother, in most cases the little brother is the key to solving the problem.
All in all though a really fun game!
Good job friend :D