Ah, a hack that is not that long. Surely I can test this one in the meantime while I am continuing to struggle with the others?
Here we go.
The intro thing with 'Chapter One: A New World: works fine, but it's very bland. Try spicing it up with a non-clashing background, for example.
The overworld looks very solid, even if it isn't ground breaking by any means. The music gets old fast though, it's too high pitched.
A Old House: I want to point out that it's 'An Old House', not 'A Old House'. It's minor but keep that in mind. Since the level is not complete, I guess I can't judge on it, but I would reccomend making in inaccesable instead of dropping a bunch of cement blocks in the way.
Green Woods: I gotta say, this level is impressive! The design is nice, the aesthatics are right on and the difficulty is good for a first level. One point of doubt is that there a lot of places where it looks like there could be a secret, but there isn't. Maybe that's something to look at, but luckily it's nothing big. The music could be a little less intense but it works.
Pipe Mountain: Again, this is a neat level, full of quality and good fun. There are a few awkward moments though. The level seems a bit devoid of enemies, which is okay, but for a Normal hack it's good if you add more. There's also this blue pipe
here, which leads you believe there's something in that and that you can walk on the bottom layer of the map. Needless to say, you can't. It's a little unneccesary. For the rest, this is all good.
Night At The Forest: This level is of a slightly lower quality than the previous few levels, but it still works just fine. The dark palette of the pipes is a little awkward. It doesn't look completely right compared to the light blue and yellow ones in my opinion. The secret exit is a little too simple to find as well, seeing as it leads you to Star World. There's one thing that tops the sheet of problems and that is that when you check the sign, the game behaves a little awkwardly. You can still use your item box and jump around in some sort of box, and that doesn't work really well. Also, leaving by pressing Up is not logical and it should be mentioned when you have to do so, as most people want to press A or Start instead. The tip itself is a little bit too direct too. I would be a little more cryptic. That's all I could find, it's still a good level, mind you.
Pipeworks Castle: Wow, this level is so solid, I literally have nothing to say on it. I just have to repeat that it's okay to add some more enemies to your level, as the difficulty is Normal and not Easy. A question I would like to ask you though is: Why is there no boss at the end of the level? Was it unneccesary for you? Does it glitch? Or is it something else? It's of course not a problem, but i'd like to ask you since it's a castle.
End of demo: Same as A Old House. It would work miracles to not be able to enter the level.
Other things I noted:
-During transitions, there's an awkward HDMA effect. I'm sure that pops up in other hacks too, but it's odd nontheless. If there's a fix that's within your reach of skill, go for it, but if it isn't, it's okay. Definetly not something that would get your hack removed.
-The background on the OW changes to black once you beat Pipeworks Castle. It fixes itself once you enter a level.
That's all. So far, so good! I wish you good luck on this, hopefully you can keep it up.