Oh yes, I've been meaning to tackle this one since before day one.
This is definitely the highlight of this C3 as far as demo hacks go. It really shows how much effort went into every bit of this just by looking at the screenshots. Everything looks extremely beautiful.
I gave this a quick shot and I just got to world 2. This is definitely on the harder side of things, but so far it's been very manageable. The levels are pretty fun and hardly ever unfair (I'm a bit turned off by that wall of fireguys in the stage prior to the castle though lol, but it's a very short first half in that stage, so I'll excuse it). I also appreciate the change of setting in world 2 (and sort of expected it).
I quite dig the fiery tone of the first world, but seeing a green field and getting more open stages afterwards is really refreshing!
You chose not to release this hack fully this C3, and I believe your choice was for the best. I look forward to the full release after you put even more polish in this. Needless to say, amazing work thus far!!
Also, the tilesets look really good, and your composition is also quite nice despite its simplicity. Nice that you gave a shot on making some resources yourself