This is beautiful, but unfortunately, but most of the sprites are not suitable for tiled usage... Some will work, but mostly they won't. So if you're planning to use them with a tile-based level editor, it's a no go :(
It's really a shame because the art style is gorgeous and I'd have loved making my game using this asset.
Update:
I am able to use the asset pack using the individual textures included, just took a bit of repacking.
I would also like to point out that I contacted Moon Tribe via email and their customer care and helpfulness is unparalleled, they took my feedback very positively and offered to help me with any individual issues I may have. Absolutely great asset pack with amazing support and team behind it, I highly recommend it.