Shameless self-promotion: we’ve started to! 20XX is co-op friendly, roguelike MMX. http://store.steampowered.com/app/322110

You can at least skip through the text at your own pace (an option turns this on even if you haven’t seen a given scene yet), which made some of the same-y-ness in the beginning of the game a lot less obnoxious. (Great review of a great game!)

Yup!

Yes, this is correct. (source: am Steam dev)

Yes. (Sorry for replying to this four months late!)

The developer/publisher (not Valve) pays for refunds. (Source: am Steam dev)