I agree that the unified theme is a great touch. You primitives are good but a little mush/bumpy. The spider is a cool idea! Spiders give me the creeps as does your sculpt, so good job there 😅 The legs are bit lumpy and inconsistent in thickness.
Melvin is your strongest imo. Feels the most polished. It maybe suffers a little from single-angle-favor, meaning it looks great from the front and ok from other angles.
Still those are minor notes. Definitely an A this week!