The demo was a sort of test, I suppose; to see whether it was possible to reconstruct it without restarting from scratch. As to the things you pointed out..
0: Aye, some of the levels not accessible yet were completely restarted. Some of the future levels show a growth in experience, and may end up being the first couple of levels instead so I have a better basis.
1: I miscalculated how much Mario could see in the last bit. The first two I just failed to notice.
2: Mario was meant to fall, but I suppose there's no real explanation as to why.
3: I hadn't noticed that. I had assumed the block bash sprites were universal.
4: The moons as coins is intentional, as pointed out by the title itself. I should probably give an explanation, however...
5: Again, I had forgotten/failed to notice. Save for Cloudland where the patterns were intentional.
6: I'd actually spent a lot of time trying to clean that up, but I can't admit I was completely satisfied.
With 0, 3, and 6 being my most prominent problems, along with a need to explain some of my gimmicks, I suppose I can safely say I need to perform a more complete restart.
I thank you for taking the time to test my hack and point out the problems. I'll be back in a few week's time with another demo; A far better one, if all goes well.
EDIT: Bleh, I mean "moderate", not test. Sorry, still very tired. Long day.
Credit for the amazing layout goes to Counterfeit!
Renaming my hack to something to do with Raphael (the Raven). Complete revamp. Demo soon.
Also userbars because Silver and HyperMario are awesome.