So I’ll keep this short on account of you not having much time: this one game by some of the people who made Titan Quest seems like Post-Apocalyptic Diablo, only a bit harder and they’re putting some effort into making it sort of a dynamic open world. They’re in the last legs of their Kickstarter, just going for a bunch of stretch goals to add content. Also, it’s completely DRM-free.
Look at their gameplay videos and see if you give a shit. It’s $18, which isn’t nothing but also doesn’t look too dang bad for a game that’s surprisingly pretty and polished. As always though remember: it’s a Kickstarter. You may be paying for shit you don’t like, and there’s no way to get money back. Be wary!