I was reading about the MSX game "Vampire Killer". It's essentially a remake of the NES Castlevania with several gameplay differences. This game has a unique enemy called a Slime. Like the Bots in the Zelda 2 skin, I feel they best represent the Goomba. The graphics of "Vampire Killer" are 95% identical to Castlevania so it would fit perfectly. If the game gets another update, I request that this be implemented.