Hmm, with this update i can agree and disagree. I personally find Kill The Needle Games 1 way harder then 2, the true stage is harder, I just overly find it a bit more difficult, 94 for kill the needle games 2 might be a bit too far.
May want to increase Happil 1 as well, the game is not hard until you get to Geezer, Geezer is a very difficult boss in happil 1 even on easy mode, difficulties effect gameplay in happil 1 so it is best to keep that in mind.
You forgot Break the Series Z. There's two of them now, and a third is on the way. There's also Kill the Blue Mage, but much of it is original content, so dunno if it would count.
This might be a good idea, and conly Blue Mage does take screens from other games and original content, so yes, i would consider this a medley, also the Z Series might be a bit hard to rate on some angles, Stage 5 looks easier then 4 platforming wise and maybe boss wise too, the devas in the game i'd say is a difficulty between kamilia 2 and 3, Series Z 1 might be easy on the other hand, I really don't know.
This is my input :3