Hey there, sorry for the wait. It's been something I've wanted to do for a long time, but my job prevented me from taking on an ambitious project like this- There are a lot of different zombies in the pack to add a crawl animation for. The crawling zombies are also going to need their own death animation.
However I have recently returned to being a full-time artist and indie developer again, so I think I can do this now.
(Edit: For anyone wondering, this comment is referring to Zombie Pack, not this asset pack.)