Hey all! Here's a great steam game that i already have. Magicka is a fun cooperative adventure that forces you to combine elements to cast spells. There are a lot of geeky references and secrets to uncover as well. There are a good number of DLCs out there for it, but honestly the base game is worth it just by itself. Oh and it is QUITE a challenge, especially solo. Requires a lot of experimentation (or study) to master.

Good luck!