Hi, your game is looking action packed and it's always nice to see less common themes emerging on the boards.
From your screenshots, the lava would certainly have an orange glow to it, but compared to the fire in the distance it looks more "luke-warm" and less flesh meltingly hot.
Slap some orange lights above those lava pools and that should be a quick way of lightening the surface and the surrounding area.
I'm going to take a guess that your setting is some form of ancient temple ? If this is the case it might be fun to think of ways of adding some height to the levels. Your rooms appear to be one grid space high all along, adding an additional level of height will enable you to add some interesting architectural features or artefacts for the player to view while they battle the corridors.
Keep it going though.