Fun game concept (and Earthbound reference).
The core gameplay is solid, although it might need a bit of polish. The borther can get stuck in a loop of falling into the same few pits if he gets into the wrong spot, and I didn't see an exit portal on the second level when I first played it.
I do enjoy the idea of protecting a different character though, while you only get knocked out temporarily, and making escort missions fun at all is an achievement in itself.