Kura5 is a free spiritual successor to Kojima's sun-loving Boktai vampire-hunting series
Long before Hideo Kojima made the first triple-A walking simulator, he was trying to spin sunlight into bullets. The game in question, Boktai: The Sun Is In Your Hand, is a Game Boy Advance title from 2003, in which you play a vampire-slaying gunslinger. The gun you're slinging is a "solar-powered" pistol, which you could charge up using a cartridge-mounted photometric sensor by physically standing in sunshine. This was 13 years before the launch of Pokemon Go. Sadly, Boktai's debut didn't result in city parks or rooftops being flooded by crowds of GBA-wielding undead killers. But it was a fun gimmick and the game itself is good enough to carry it - an isometric dungeon-crawler in which you have to find a vamp's coffin and drag it to the surface for purgation.