Well, I played the second demo. So far, the story is getting very interesting and you addressed some grammar issues that I and Green Jerry mentioned. Level design-wise, there isn't much I can say. You really like difficult setups and new gimmicks.
However, there's some issues you need to address.
Before I talk about the issues, here's some stuff I found very nice in this new demo.
NICE STUFF
GROUND POUND
The implementation of the ground pound is great. It works way better than your old shake all the screen ASM. Now the level flows a bit better, and also, it's more intuitive to do a ground pound than press up while midair. Good job.
GHOST BLOCKS
This mechanic is very creative and well implemented. And very challenging. A bit cruel, but I like it.
SPRING LAWFARE 2
A more calm level with focus in collecting coins. I loved that. Great job with it.
ISSUES
OUTDATED MESSAGE BOX
Since you added a new mechanic in the place of the old one, you should update the message box to explain about this gimmick.
POWER CITY. LM1
I can skip the secret section by just swimming, cheesing your challenge very easy. one solution I propose is to add an air meter in this oil liquid, so the player is discouraged of falling in the oil and must cross it via the hazards you put in. Just point that out, since I avoided all the traps so easily.
CASTLE 3 - GRETA THUNBERG
Please put another powerup block, because this is the only boss you get only one block before the fight. Would be way more fair, since you plan to keep these nasty Mega Man 1 enemies. At least, two blocks of powerup so it's consistent with all the others castles.
GRAMMAR ISSUES
Instead of "get", you should use "got".
I'm pretty sure you mean "This is a vanishing block", instead of "This isn't a vanishing block". Fix this typo.
Instead of "would", it's "will".
The correct would be "I wish that the Turner family was here too!"
Also, you need to rephrase some message boxes I mentioned in the previous demo. At least, fix them when you release the full hack, since it's a demo, for now, it's fine. But be aware with typos and grammar mistakes.
TRUMP CARNIVAL 1 AND 2 (SUB-AREAS)
I don't know if you are using the background that I ripped or if you ripped it yourself, but there's tiny cutoffs in the clouds of these high sections.
CASTLE 5 - DINKLEBERG
Dinkleberg's face is glitched. I assume that the tilemap of the sprite or that you changed the order that the graphics are stored.
And, I guess that's it. Very great demo. Can't wait to see the final game. Your level design has been improving so far.