I love the aesthetics so much. Did you use STEAR to remap the graphics or just some exGFX?
For blocks and sprites, I used ExGFX with some color changes to transparency. The lines in the background are also ExGFX, namely rope tiles but in layer 3. I used fast auto-scrolling to the left for it.
Anyway, I've made some changes like addition of skull blocks with new GFX and ExAnimation. I used ExAnimated red for the blocks for better distinction from the rest. I also intend to make a boss that fights like Big Boo but with its unique GFX.