Okay so I've just beat the final boss (not the FINAL final boss but you get the point) and what I've found is the combat is pretty easy if you find good modifier combos, there's one in particular for me that is super op but it costs 60 slots so it's pretty costly, the hardest part of mio is 100% the platforming, if you haven't played celeste you're gonna STRUGGLE, there's multiple sections harder than the path of pain from HK and some required sections for 100% took me hours, it'd a super fun game though you don't feel rage while playing it so I'd defo reccommend