Does this game have online co-op?

[St_Winter]

I've seen were someone posted before when i googled it but it was a year or so ago. The steam page is a bit confusing so i figured i would ask here. I'm basically looking for a online co-op game i can play with my sister since she lives a 11 hours away now and her computer doesn't run a lot of games well. (only games like; l4d2, minecraft, Gary's mod, etc.) I saw this and was hoping it did have online co-op because she would love the art style. (she's a big fan of adventure time lol)