I've thought about a meter, but players would just click away until the meter saw just right. I believe the best way was to slap on biodegradable symbols.
I think you could use a little more indication that the steak is getting cooked/overcooked. Might just be a bug with me, but I can't seem to do anything on the steak level. It's an interesting take on cooking games. I like the idea.
I noticed the lighter lit the wood just being near it. I think it would be an added challenge if you had to light the wood manually instead, especially in the dark. The other mechanics of the game work well. Took a few tries to beat.