No revenue estimate for EPIC — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $16.3M — a different platform, not this one.

Witchfire

Witchfire is a single-player RPG shooter from the creators of Painkiller and Bulletstorm. Embark on perilous missions, slay enemies, and upgrade your arsenal. Scavenge resources and retreat to your sanctuary, or risk it all against Familiars—fearsome guardians of the witch.