Adding to this thread as someone with good colour vision - visual clarity is atrocious in EX4. Colours are similar, there is no difference in texture, this is bad game design, my group ended up just memorizing the floor patterns cause nobody could see what the hell was going on.

Here we have dark red flowers on a dark brown background with both safe and unsafe fields having the lace texture applied, the boss overlays orange and purple over that, it's a mess.

Encounters need to have better contrast between colours used to indicate mechanics AND difference in symbol / shape / texture used. There should always be at least two ways to quickly identify differences.