@Silver, the graphics are awesome, the ghost idea is pretty creative and cool,
however, I think you should arrange them better, because it's really obvious, that they are blocks now
For example, do it like the trees from Forest of Illusion in SMW:
They have 16x16 trees in one block ( what looks like this: [O][O] )
but also a formation like this: [)(][)(]
If you remove the brackets...
OO
)()(
I hope that makes sense^^
NVM I failed. However, remove more ghosts, having more "holes" to create a better effect. It looks now to obvious that the boos are blocks
On a related note, I scrap my tropical idea, simply it's not really SMW like (and Map16 Limits makes it impossible, too.)
Instead I make a cave filled with dolphins, Rip van Fishes. It's a mixture of cave and underwater. Addtionally, a Layer 2 Part for action. Sounds a bit different from SMW (more varied) but it should fit nontheless.