Realm of the Mad God

DECA Games' bullet-hell MMO shoot-'em-up with permadeath. Originally created by Wild Shadow Studios (2011) and remastered as Realm of the Mad God Exalt. Co-op PvE — dozens of players fight through the Realm, defeat gods, and raid dungeons; death is permanent unless a Resurrection is used. Free-to-play on PC (Windows/macOS) and browser, with F2P microtransactions.