Are there enough buttons on the GP to play this game effectively? Create Tree, Boulder, Robot. Absorb. Transfer. Hyperspace. Look around on stick. Pause. (Have I missed some? Turn 180 degrees perhaps? Map?)
I guess a rewrite could fix it. Pressing A would create a Tree, press it again without moving (double click) could create a Boulder, and triple click for Robot. B to Transfer. Select to Absorb. Start to pause. Hyperspace as right shoulder.