In my humble opinion, Space Alert can't be beat. Just prepare to explode a lot; like any good co-op, there's a learning curve. After you get hooked, get the expansion, which comes with an addictive character progression system with achievements (and ridiculously hard threats, for good measure).
I really wish there was a version 2 or something. There are lots of annoying quirks in space Alert which could be improved, like the interceptors which never get used. And the lack of any proper difficulty settings.
I'd love a proper Legacy style version of it. I bought the expansion but it seems to add a lot of complication without enough value.
