With the GB screen being so small, I think it was ingenious to add that 3rd dimension for the final boss fight. It felt very natural and the telegraphing for the upcoming attack worked nicely.
I also immediately liked the rock textures and the mob death animations were oddly satisfying. The plot twist was also great. It's what players crave.
As deviantol pointed out, the "run" key feels like it wants to be held down for the entirety of the game which leads to finger fatigue.
