It's great! One suggestion / request I have that I feel could fit well in this pack is to have a poison cloud animation. Ideally with one animation for where the cloud appears and then one looping animation for the cloud. It could be used in different ways, for example as a trap, or when you destroy one of those bottles that have the green substance, or maybe even as an enemy attack.
It's just something I think would be cool to have, especially in games that already use poison damage.
But anyways it's already a cool tileset :)