I just finished playing through it, and... it felt a bit different from your previous hacks. I like it! Some of levels are really enjoyable and some creativity was put into it, which is very good. Levels are quite varied, which is also a plus.
However no hack without issues, and there quite a lot of them:
-I can crash game by throwing shell or similar out of level boundaries.
I thought you've fixed it, but... no?
-Tile with flower's palette is not matching bush's
-Bottom tile of A-Coin wraps vertically
-In speaking of A-coin, key gimmick doesn't works well, because I can pick up 5 coins, but not have a key, collecting the one that spawns the key again spawns it. It works better in places where you can't go back, like in COLA CAVERN 3 (A)
-Death animation looks very weird.
-Some of early beach levels use ledge tiles instead of slopes for trees.
-Cutoff (I've disabled layer 3 to show it better)
-Blocks that spawn something on layer 2 don't work well...
-In any situation when you spawn A-coin, it appears to be misplaced.
-When I press P-switch here Key turns invisible. must be sprite tile issue.
-Bowser's palette issue
-Can't pick up A-coin with shell here for some reason.
-Piranha plant going behind layers is :no_good:
-When I eat berries here, they turn grey
-All those muncher columns look cutoff.
-Minor cutoffs with edges.
-Very hard to tell where's solid ground, i'd move it up or something.
-Dot doesn't appears when I get exit here, but it does when I get exit in COLA SECRET 2 (!)
-I can throw objects through this pipe, because it's on layer 2.
-SMB2 wrap is bad. You need to stand right in the middle of the platform so you won't fall from it when it teleports or when player's teleporting.
-I somehow managed to stuck here when P-switch timer ran out. HELP!
-I managed to get springboard stuck as well. HELP!
-You can still interact with koopa when it's dead as if wasn't dead at all! HE- ok.
-Did you know? I can get stuck here.
-Angry sun from SESAME SANDS 4
can be killed by shell, which kills some challenge.
-And some glitchy things in END OF DEMO
That's it. Despite those issues it's still a good time.
Keep it up!