Bare-handed
The Goo Well is filled, and the solver putz him there.He findz there is a Tool (Tool #4) available from the GruntzMachine (Resources) and starts using it.
He never exchangez it for any other Tool!
(But pickz up several Coinz
for his effortz.)He usez his Shovel
to fill in Holez 
and dig up Moundz 
, miraculously removing Ice Crystalz 
covering Green Toggle Switchez 
(GTS). Activating them allowz him to proceed past (lowered) Green Pyramidz 
(GP) (otherwise) blocking his path.His ultimate purpose is to stand on a Purple Multi-Grunt Switch
(PMGS) located at X=42, Y=13.