One of the best cooperative games I've ever played. It's not easy, but it is rewarding. 4 stars because it's not Terraria (max) levels of fun, but close.

While playing I'm constantly amazed that I'm having fun scrolling a PDF file, or having the same amount of fun clicking on different colored lines. Definitely recommend, even if just trying it out.

Side note: if you're colorblind this game is way harder, if possible at all.