jesus fuck, those feet! they are bigger than the rest of the leg!

Base +7, Muffdiver884 +8, JoHal +12, Azzabum +5, Negro323 +6, Iwakura Yuri +6

I get that technically they're aliens, but must they have alien body proportions?

Base +22, JoHal +12

The artist is just following the characters' proportions imo. They're like 3.5 heads tall, they're gonna look cartoony when next to a real human.
In fact the originals have even more "alien" proportions: https://imgur.com/gallery/IQwC57o

If you want human proportions then just go with Nearphotison, it's like humans wearing furry suits... https://e-hentai.org/g/1421256/8cd74452e9/

Base +6, Muffdiver884 +8, purupuru21 +6

This is the first time I've seen someone draw a hand under a Sonic character's chin like that. It's kind of cute to see this perspective.

Base +6, Muffdiver884 +8