Amazing co-op 3D Platformer collect-a-thon Metroidvania! Maybe the best?
My BFF got this game as a gift randomly and so we went for it.
Ended up 100%ing it in ~48 hours.

Laughed a lot. This game is ridiculous. Watch the Blobline advertisement, the blue goo food advertisement, and the portal potty ad.

Mobility becomes very fun.
It brought us back to old times playing couch co-op, but over the internet.

One of the best games ever (top 50), solo or multiplayer (it's mostly a multiplayer game).
Fast paced, difficulty is selectable, lots of end game content, fun to play and level up all four classes and unlock new guns and their abilities/builds.

I've played this on Xbox Cloud gaming platform on an ipad, it worked ok until higher difficulties when my lag couldn't keep up with the chaos. But if you live in a big city that probably wouldn't be a problem.

I've also played on a Mac where I have to use it through Whiskey. Lately there is an annoying banner when the game is full screen. Please fix that!