Okay. I played this level.
Difficulty
To put the difficulty in simple terms, the areas without fire piranhas were a cakewalk, and the areas with fire piranhas were absolutely ruthless! Too much ups and downs in the difficulty. Also, that SMB2 section was really easy, even with that Hammer Brother.
Dragon Coins
The first one was really easy to get. Like, really really easy. The second one was hard not to get. The third one was slightly cleverly hidden, you just need the leaf to fly up there. The fourth one was pretty easy to get. The fifth one I missed because I was going too fast to stop and pick up the buried items.
The Look
This looked somewhat good, but not all that good. You had a good amount of cutoff, like right here.
. There was some, but not a lot, of clash as well.
Also, on the part with the waterfall and SMW bridges, you forgot the background that goes on the SMW bridges, like so.
Another thing is the windows on the ship. Those windows were the perfect time to use this BGO.
Coin Placement
I felt there were a little too many coins in this level. You want to have a lot of coins in your levels, but not so many like you put.
Some Wierd Things I Noticed
There's water throughout the entire first section, even where it wasn't necessary.
On the out-of-bounds left wall for the second section, those blocks can be destroyed by Hammer Suits. You can't normally get a Hammer Suit in this level, but just saying.
Overall
This level is either insane or a cakewalk, depending on where you are. It was fun, but frustrating, to play. There was some clash, cutoff, and barely any BGOs.
I̶ ̶f̶e̶e̶l̶ ̶l̶i̶k̶e̶ ̶t̶h̶i̶s̶ ̶i̶s̶n̶'̶t̶ ̶b̶a̶d̶ ̶e̶n̶o̶u̶g̶h̶ ̶t̶o̶ ̶b̶e̶ ̶i̶n̶ ̶T̶h̶e̶ ̶T̶r̶a̶s̶h̶ ̶C̶a̶n̶,̶ ̶b̶u̶t̶ ̶i̶t̶ ̶m̶a̶k̶e̶s̶ ̶i̶t̶ ̶t̶o̶ ̶A̶v̶e̶r̶a̶g̶e̶ ̶I̶'̶d̶ ̶s̶a̶y̶.̶
EDIT: Didn't notice this was on 'Casual Levels'.