Just tried my hand at it, essentially all I did were the two middle sprites. Credit goes to DeepSeaTooth.
As for the inner circular outline of gooey himself in the two sprites with the spikes.. I'm thinking if I should just remove it? What do you lads thing?
EDIT: I've uploaded the sheet with both, so you guys can make your choice.
By the way, I'm working on the neutral combo. No idea when I'll be finished actually.. I'm really lazy, but I've got a weekend now, and I'd rather do that than homework, so I can't imagine it taking too long.