There is some flaws that can be worked on, this appears to be your first hack, so you've got some work to do to make it great! The first level had some junk in it i didn't get, but I'm guessing this is a hot off the plate build so it's all good lol. But nothing, in my years of playing Mario games, compares to the sheer frustration I felt while playing level 2. The HDMA effect is abysmal, completely ruins the level and makes it nearly impossible to see anything. If you want an example of a good way to do this, here's a patch that should be able to help you along the way. Here ya go I haven't played any of the levels afterwards, but it has promise! It just needs more work and some love and affection. Tip of the day: Make your own overworld instead of modifying a preexisting one. This way you can build levels and gimmicks around what it looks like from the overworld and give your player a sense of progress. But that's just my 2 cents, best of luck! Aaaaagh i played more of it and i have more cents to give!!!
The abstract world looks amazing. It clearly appears that your hacking ability has gone up from the start lol. The later levels are also pretty great in the dev map, very fun in some of the levels case! I also forgot to touch on the title screen, it's beautiful and got me seriously hyped for the game. Remaking world 1 would definitely boost the start of the hack because there's loads more fun to be had from the more i play the more i enjoyed the hack. Outline mountain is BRILLIANT! fantastic concept that definitely will lead to some tricky platforming if the level is designed as well as the beginning. and oh my gosh, security gate is GREAT!!! I'm sure theres more great moments in this hack, it shows loads of promise!

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Current Projects:
Super Kekcroc World 3