This hack has a couple of apparently unbeatable levels and some of them with red dots don't have an apparently secret exit. Also it's not hard, it's even harder. Imo, this would be a Kaizo: Light.
The title screen shows SMB 1-1 level, which doesn't have to do with the hack itself:
Also, overworlds seem to be small edits of the original SMW, here is an example:
Another example, Star World has the same shape as the original SMW.
As for the level design and aesthetics (you've used some custom blocks though), I think you got inspiration from Kaizo Mario World series. Levels itself aren't bad, but not the best either. Screenshots will help you to have a better understanding of this.
In Vanilla Coco Bridge, there is a high amount of munchers (floating and in weird places), which aesthetically are not pleasant to watch, though it is based on Kaizo so I can't say much about it. Also, I can't figure how to get the secret exit, I could't find the keyhole, just the key.
In Baby Sky Tree and the third Sky Tree Jump there are instances of cutoff.
In this section of Sky Tree Roots, sometimes the Chuck will come too late to break the blocks, so it depends on the luck and can be frustrating.
In Linda's Metal Works, there are a couple of instances of design issues:
Old hacks style:
Narrow space with jumping and fire-spitting Piranha Plants and Bullet Bill Generator, making artificial difficulty and probably making the player start that zone again:
Another secret exit I can't figure out is the one in Magma Caverns
(key and keyhole are behind goal post though)
.
Hydra Path is a non-linear level (there are two ways), the left one with water which
takes you to the secret exit
and the other to the right which is supposed to be fire but it's just red water, you can fix this changing how those tiles act in the tile editor:
Another cutoff in Ted's Cove:
Fun In The Sun is incompleted (at least you activated two-side exit)
and last part of FG with the last sand castle is fake(players can fall through it):
Aqua Tower can't be completed due to the rails acting as a solid FG (this happens in other levels too):
Sunken Ship, although there is a ship, it looks more like an underwater cave.
Mistery Forest 4 is supposed to have a secret exit but I can't find it. Also they are very similar to Mistery Forest 2 and Mistery Forest 3, I guess you thought about original Forest of Illusion.
Forest Oasis should also have a secret exit, I only found short and simple level with the normal exit (green Wiggler) and a kitten in the top of the trunk, maybe that's a clue? Or just decoration?:
Illusionary was a confusing level in terms of design, players could make mistakes between the FG.
Some levels from Star World were good (Dino Hills and Starlite Night, while others could have been better because some ideas were good (Rainbow Run)
One of those levels, Frost Burn, mixes fire with ice. While the idea is good, design isn't outstanding (not bad). This kind of labirynth filled with black blocks made me though they hurt and they didn't, instead they melted with Fire Bro's fireballs:
For the last levels:
Ground Runner has interesting design, but that glitched FG seems weird:
Carrot Fissure was a good level! Intense platforming while avoiding spikes!
Bowser's Castle can't be completed due to the fact that the big red door can't be entered for some reason (tile acting probably), it's a pity because it's similar to last level from Kaizo 1.
In other words, the hack has some good levels and ideas, but some levels haven't the best design. The hack is OK. As a suggestion, you can play other kaizo hacks hosted here to get an idea. Hope this doesn't discourage you, hope this long post helps. Good luck hacking!
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![#tb{:]}](/images/emoticons/tb/cloud.png "Cloud Face")
Ok going to try and go at your post in order N450. I agree with the Kaizo: Light, so i changed it in the first post. Wish there was a better definition for what is a easy, normal, and so on those. I've always been nostalgic About super mario bros. Thats why I made the demo. I think others will be the same way. Ok the over world now. The screen shot of Vanilla coco bridge level was pieced together from yoshi island. Why it looks so much like it. The star road I did use because I liked the star shape. It works great with the star road both in idea and form. Ok now for Vanilla coco bridge, I cleaned up some of the munchers and made it easier to find the exit. Next fixed cutoffs in Baby sky tree and Sky tree jump. Made Chuck more forgiving. Redesigned the last part of linda's metal works. Magma caverns secret exit is there and you can get too it. Don't want to say too much about it those. Have some things almost done for it. Hydra path red water was done on purpose just to mess with people a little and too show it was the easier path. Fixeed cutoff in ted's cove. Fun in the sun is just for fun. Doesn't count for exits. Never even have to go in. Fixed aqua tower line guides. Found out when I was trying some thing new in the map 16 it messed up stuff.(Changed act as) Same with the big red door. Your right about the inspiration from Forest of Illusion too. Theres hints to finding the exits, and I will say this. The level(s) where made to play them going right or left. Forest oasis is the same a magma caverns. Can't say to much. Illusionary I removed some of the FG to make it easier to see and play. Frost Burn changed the black blocks too a dark blue too look less dangerous. Ground runner the munchers on the bottom are a custom block designed to blend in a bit more. Fixed Big red door. 
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