|This game is surprisingly very addicting. I've started playing through on hard mode, attempting to Perfect-clear each level and all the collectables in one go. Although, I'll probably need to go back and use a guide to find all the hidden retro stages.|
It's pretty much just pure precision timing, with some memorization involved on hard mode. And the collectables and alternate exits usually involve beating the level multiple times to explore all of the paths.
I don't care about getting all Perfect+ on every difficulty (which is the same as Perfect, except also hitting the bullsye at the end), although I might wanna eventually go for all the "Rewards". One of the reward conditions is getting a Perfect+ on all 100 stages, but difficulty doesn't matter, so I'll just try to do that on normal or easy after I 100% the game on hard.