It uses
You must be registered to see the links
. There are a few games with its default interface on Steam (Mirror Shot, Bunny Count). The vehicular combat, helicopter and flying would likely be separate templates (there are many available).
Probably a kitchen-sink project done for fun with already-owned, free or pirated assets and you're seeing playtesting footage with debug mode/console/cheats (he's playing alone against bots). Or it's a recent cash grab or shovelware.