This is a mod of Vlambeer's "Wasteland Kings" (which was later developed into Nuclear Throne).

It tweaks a couple of things, but, most importantly, adds local and online multiplayer support for up to 4 players.

Would be great to hear from you on what works, what doesn't, and whether you think that this kind of online multiplayer would suit the actual game.

Not affiliated with Vlambeer.

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News (April 9, 2016):

v1034 introduces a Linux version for both "raw" and Steam-based multiplayer. Currently without cross-platform multiplayer.

Additionally, Don't Crawl, a game that I'm working on, is currently on Greenlight, has online multiplayer, and works on multiple platforms too. Perhaps you could take a look at it?