The soundtrack for Fez is amazing, and the concept is great, as is the actual game. Not cheap at all, but Europa Universalis IV is great. I've clocked 450 hours on it, and I'm far from bored. If you want something cheaper, and don't mind lots of DLC (paradox pls stahp my wallet is dying) Europa Universalis III looks like (I haven't tried it but how different can it be? ) mostly the same thing. The base game is £10, compared to the hefty £35 for EUIV. EUIV is on sale frequently however. It can drop to around £8, which will not hurt your bank account too much.