Sanctum 2 and Train Valley 2

Build things before time runs out!

Sanctum 2

This one to four player cooperative game is a first person tower defense where you will be scrambling to build walls, often in serpentine patterns, to force the waves of alien scum to pass right beside your variety of turrets. Block their path however and they'll just pick a wall to break! The game feels pretty ridiculous and floaty but at least you have something to do when you run out of resources to build stuff... you can shoot things directly! Right in their weak spot! It's ok, but obviously super shallow and there are many better cooperative games out there.

Train Valley 2

In this game you are given a small map and some money per level to build railways to connect workers to their labor sites, and you need to be careful to not let your trains derail or crash into each other as that costs lots of money to repair! Strangely, letting people die is ok since they naturally replenish but running out of money is a game over. Honestly I have not run into such a bad interface though. Connecting tracks is tedious, erasing tracks is tedious, and the fricking tutorial itself often derails your learning literally as it gets in the way at the worst possible times. Not recommended at all!