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.