Actually surprisingly delightful to play for what I first thought to be "just another 2D platformer" entry :)
Animations are super cute and the slow introduction of new mechanics make me keep going to get that next mysterious box.
Physics feel a little weird to me, so it's a little clunky to get Gamebert to what I want him to. I noticed I cannot jump when he's very close to a wall and got him stuck even at the end. (see pic) Maybe a smaller hitbox can fix this?
Otherwise, great game, would play again :)