There are only a few inputs you can make in this game. Moving or will move your character, but will feel more natural. You can also use or to jump, with and being used to perform actions or grab onto things. That's all of the controls right there.
The game also has a brightness setting. Although this would help you see certain areas a lot easier, you should play at the default brightness on your first playthrough to get the intended experience. Maxing out the brightness on your 5-death-maximum playthrough (the second time through the game) is encouraged for easier navigation.
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