These coins are upside down. Actually everything that uses the spinning controller sprite is upside down.

The value that controls the orientation of rotation-controlled coins, question blocks, and brick blocks is value 12. Setting that value to 2 will make them appear right-side up. I think 1 works too but the original game uses 2 so...



You can see the rotation-controlled coins if you scroll the camera up far enough.



Generally, if your level has heavy vertical elements you need to adjust the scrolling so Mario isn't nearly at the top of the screen at all times. I don't know exactly what the upper and lower bound stuff means, but copying the values from an unedited tower level is your best bet.

Also that is a terrible place to put a coin roulette block. If you get 30 or 50 some of them will go off the side and they'll despawn.



Ew, wonky layers. I don't know what's causing this but it's weird.



...are these invisible blocks really necessary?

(not shown: Hammer Bros are not early-game enemies!)



These Goomba stacks don't show up properly while Mario is entering the area from a pipe. They should be moved off-screen of any entrances to avoid this problem.

The moving spiky rocks from a few screenshots up also have this issue.



This is just a nitpick, but it's strange seeing the NSMBU grassland up until this point and then using the original grassland graphics here.



My original complaint was that the pit looks like it has a warp in it due to the layer 2 rocks. Then immediately after I took the screenshot I realized this is a port of SMB3 1-1.

aaaaaaaaaaaa

Please don't make remake levels. They've been done to death. I didn't download this hack to play 1-1 from another game; I downloaded this hack to play your original levels.