I want to approve this hack. There are some good ideas in the levels and the graphics are surprisingly well imported, aside from some exceptions.

But there are problems with it as it is right now, change these and I'll approve this.

#1 - Camera Problems
Sometimes I can't see where I'm going, or just can't see the ground. This is a problem especially in 1-2; I frequently fall down the same few holes because I can't see where I'm going to land.

#2 - Some Kaizo-ish traps
I'm walking around in 1-2, the brick block bridge isn't solid and I fall to my death. I jump to the switch in the middle of the bridge and the whole thing collapses. I figured that the trick is to quickly bounce of the switch to get to the pipe, but it's just bad level design.

The Star Coin-Thwomp trap in the Castle is also a good example.

Basically anything that kills you if you don't already know what to do = bad level design. Get rid of them.

#3 - Desert Music in a Forest!?
Also, what's with the mushroom that falls from the sky in 1-3?

#4 - Not-A-Secrets
There's plenty of places that are designed that give the player an illusion that something's hiding under the screen. Nope, just death.

#5 - Anti-Gravity blocks are weird.
I know that's kinda the central theme of 1-Tower, but it looks buggy and doesn't really have a logical explanation, so for now it's best to forget about it. Also in this level, spikes burn you to death like lava. wat?

#6 - "TILESET BY IJAH"
4th-wall-shattering-but-gameplay-wise-useless-text is redundant.

#7 - A lot more than 8 Red Coins
1-5 is perfect for spamming yourself some powerups/extra lives.

#8 - Let's get hurt to proceed
Deliberately making someone hurt themselves to get through a small hole - plausible for a secret area. Compulsory to proceed? Not good.

Lastly, there's a part with an underground tileset in a desert overworld, and a desert tileset in an underwater level. That doesn't look good, just hack-ish.

Well, if those things have been fixed then it should be ok to approve it. I'll do that now.