After gaining the green keycard, there's a door in sector 1 (in the yellow area) which you're able to open. To get there you have to go through the whole of the sector, fighting off easy enemies with a single shot. Then you get through the green door, and blue dogs start jumping at you and it's just a bit scary.
Anyway, the green sector is relatively easy, once you've levelled up a bit. Again, though, I didn't find many secrets along the way.
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