The grapple would feel a lot nicer if it only disconnected when you jumped or released the button. Having it disconnect when you reeled it in all the way in particular was annoying and meant I rarely intentionally used that mechanic, so the grapple mostly ended up feeling like a janky wall jump instead of an actual grapple.
Save points not restoring your health is weird and the one in the red pagoda is really poorly placed, having an enemy right next to it. The pits in the underground area are obnoxiously hard to get out if you fall in too early, and since the one on the right has no way to take damage I thought I was softlocked the first time I fell in it.
Still a decent game all around. The hat upgrade was really clever.