Vlambeer's Serious Sam spin-off/remake/demake/upmake/downmake/JRPGmake Serious Sam: The Random Encounter was always a bit of a bonkers proposition. The gameplay trailer (below) hasn't really done much to change that perception. It is quite random.
And it looks totally awesome. Vlambeer say: "The game'll launch on Steam & some other digital distribution platforms October 24th for $4.99. We're pretty damned excited, that's our first commercial release, I think." They're right.