@Master0fHyrule a genetically modified super soldier works for illuminati and goes on a mission to kill jeff Bezos and a cult leader and after he's done he gets betrayed by his own pepole
"add a full body with IK arms to the game"
You're literally a 6 foot tall hot dog with floating hands in this game. It's central to the story.
"ok I'll be honest I have no idea the angle to take to complain about this now, that was a real curveball"
Even the more business-minded people around can recognise that if you pirate a game, then enjoy it, spread word about it and get someone else to buy it, that's at worst an equal trade, at best an additional sale that wouldn't have happened if you hadn't pirated it.
As creator of said game: You should support indies if you can, but culture shouldn't exist only for those who can afford it. ULTRAKILL wouldn't exist if I hadn't had easy access to movies, music and games growing up.
If you don't have money, you can support via word of mouth.