I may state the obvious, but here is my feedback and a suggestion about critical injuries
Crits seldom happen on single hits and most often if you are surrounded by zombies and getting lots of hits in a short time frame (as expected). But since you usually get all different crit injuries simultaneously as a result, you then also need a complete set of healing items to shorten the duration of them.
I think it would be better to have each injury in multiple severities and repeated crits mostly increase the severity of the injury and seldomly add other types of injury.
Because then you would often need one specific healing item which you might specifically look for (honey in tree stumps, sewing kit in clothes stores ...). Which is emergent storytelling or an intrinsic quest. As it is now you either have packed everything with you or wait it out, but it does not make much sense to look for healing items because you can't hope to find a nearly complete set anyway.
Crits seldom happen on single hits and most often if you are surrounded by zombies and getting lots of hits in a short time frame (as expected). But since you usually get all different crit injuries simultaneously as a result, you then also need a complete set of healing items to shorten the duration of them.
I think it would be better to have each injury in multiple severities and repeated crits mostly increase the severity of the injury and seldomly add other types of injury.
Because then you would often need one specific healing item which you might specifically look for (honey in tree stumps, sewing kit in clothes stores ...). Which is emergent storytelling or an intrinsic quest. As it is now you either have packed everything with you or wait it out, but it does not make much sense to look for healing items because you can't hope to find a nearly complete set anyway.