These are really good for minibosses and maybe even stronger enemy! I haven't tried to beat all of them yet but so far they are a fun challenge. (Also, Is there a separate sprite sheet found for the SMB3 Elite Koopas?)
The spritesheet that comes with the download has both SMW and SMB3 versions.
i never performed a shelljump and it's sad I did a grand total of 4 shelljumps in my life!