I've just started Starseed Pilgrim, and there is one thing I don't understand.
If a plant touches a black box, the plant starts to get contaminated, one cell at a time. If the character touches a black box or a contaminated cell of a plant, the character falls in another dimension where black boxes are keys, cells of plants are empty spaces, and empty space is solid rock.
I have tried collecting as many keys as possible. But every time, I have to hold "H" to make the character die because he is stuck in the other dimension, so no progress in collecting keys.
What do they open?
Can I skip collecting them without worrying about that they might be useful later?