No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $3M — a different platform, not this one.

Jotun: Valhalla Edition

Jotun is a hand-drawn action-exploration game set in Norse mythology. In Jotun, you play Thora, a Viking warrior who died an inglorious death and must prove herself to the Gods to enter Valhalla. Explore vast regions of Norse Purgatory to find runes to unleash the jotun, giant Norse elementals. Fight them using only your massive two-handed axe, the blessings of the Gods and your skills! Impress the Gods! Jotun: Valhalla Edition features the brand new Valhalla Mode, the ultimate battle against even fiercer versions of the Jotun! A true challenge for those who wish to impress the Gods! Experience beautiful hand-drawn animation Fight five epic jotuns, giant Norse elementals Explore nine vast and mysterious levels filled with Viking mythology