Any chance keys/doors could have a tiny number in one corner, or different numbers of stripes or something? I'm not colorblind but I'm still having trouble with orange vs. red because I keep my monitor dim to avoid migraines.
Edit: I just got to 1-8 and I wish you'd mentioned hovering keys/doors earlier, that solves my problem. Still might be trouble if I couldn't see *any* key/door colors as I"d have to hover each one, but this is workable for me