But there was no brightness selection in the game at the beginning. In general, the game is so dark that I don't even see where to go in it.
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Are you sure you are playing this version? Maybe you made a mistake and are playing the old version that I posted on itch.io 2 years ago for free, that version was very different, now the game has changed 50%, completely new art, new options, new story, new cinematics. You get brightness options at the moment you start the game. You might need to delete your version and download the newer version. Also, the epic games store version has achievements if you are interested in them.