Here are the levels MilesLuigi has used savestates on so far in SMWCP. Here you can agree to disagree on using savestates in these levels. At some point I am sure Miles will go into a full savestate mode (possibly by W3, some levels from there on out are reasonable but in general I felt it necessary), but for now...
-Treacherous Tower
-Weeaboo Manor
-Football Canyon
-Grinder Castle (no legitimate attempt made)
-Unearthly Hollow
-Danger Mines (one minor rewind to avoid re-doing a section to save time, did not cheat death)