Great game!!!
PROS:
1) The music is ear candy.
2) The player is informed about the game elements in a well-thought-out sequential manner.
3) The game is very engaging, keeps the player hooked with minimal elements.
POSSIBLE IMPROVEMENTS:
1) The brother can use a smarter AI rather than just following a straight path to the player. The current approach makes him float over objects like a ghost.
2) The location of keys can be randomized.