It's a gay game (edit: it’s a male only npc game with selectable gender for main character) ... corruption of champions (1 or 2) or trials in tainted space ("tits") have female and some male characters if you wanted more female characters. It also has a tag as gay.
Viewing post in Lust Odyssey (NSFW Visual Novel) comments
All of the romanceable/bangable options just so happened to be a bunch of dudes, several characters are canonically bi/pan ((Arthur and Rylan for example)) regardless of the gender of the player character. The Creator themselves happens to be LGBTQI+ ((A gay man, if I recall correctly))
I don't know what you would call that, but I certainly wouldn't call it straight.
It's not "just so happened." That was fully intentional.
I certainly wouldn't call it either straight or gay. i might call it bi/pan as you yourself already did, or just LGBT+.
You appear to be acting as though I don't have a comprehension of LGBT+ identities. I am an AMAB nonbinary androsexual person. It is because I understand LGBT+ identities that it is very clear to me that this isn't at all anything I would call gay.