What I have so far is:
Most of EHZ Act 1
I actually really like what I've got, and I hope you will too. I've remade the level layout with the intention of keeping it feeling like Emerald Hill Zone. But, I feel a like there's a little Palmtree Panic and GHZ influence in there as well too. I've done my best to avoid cheap deaths, add rewards for exploring, add branching paths and secret rooms, and overall make it more difficult while still keeping it in line with a first level.
I've played with the code a little and added a custom monitor that is hidden somewhere in the level. It's just for fun, nothing legitimate or fair happens if you find it =P
I've also messed with the tiles and fixed a good bit, but not all, of the tiling errors, and added a custom tile too.
If I get around to it, I'd like to finish EHZ2 and "alter" the boss, and maybe add my own badniks if I find a need. I do have good Ideas for CPZ as well.
Try it out, check out the different ways through to level, and try to get to the secret areas. Let me know what you think. If/when you beat EHZ1, the other zones are there, but there's no rings, have fun!
EDIT: Also kindly note anything you thought was dickish or any bugs you find other than tiling errors. I'm also aware of the fading palette issues if you find the secret monitor. Trying to find the code that handles the fade out and fade in has been a bitch, and I'm still looking.