/vr/ - Retro Games

>>6723842
>once you get the secret parts nothing else will matter.

This being said you get them pretty late, iirc on the game's 4th or 5th loop. Every time you beat a story mode loop the game becomes a bit harder, and you need to beat it 4 times for 100% completion.
I recommend getting Wily's engine when you beat him the first time.