Hello, SMWBros! I actaully really like the level design here. I just found a few things. And I'm not a moderator or anything so don't take this stuff the wrong way. These are just suggestions.
Just a bit of grammar here...
"Mario was traveling to somewhere..."
It might sound better if you get rid of the "to" and said "Mario was traveling somewhere".
When I hit the P-switch, there's no music change. It's hard to tell when the time runs out.
Wee bit of cutoff between the bridge and stone blocks.
The door just being a black hole looks kinda weird. But I think the secret exit here is very well hidden.
Is there any reason why I can't move right or down when I finish this level and open the path?
Good luck with this hack, it looks great and I can't wait to test your future levels!