Get 10/10 from Pro when he plays through your game.
The easiest way of doing this is creating a couple rooms of high-quality content - music, powerful monster, healing potion + treasure, another fight after he's had long enough between them, another healing potion + treasure, a music change, another fight, another healing potion + treasure, and then a teleporter which takes him to the end of the game.
The goal here is to avoid letting his meter ever decrease, and making sure that nothing gets dull or repetitive for him.