Thanks for the feedback. There are 3 lanes on the bridge and each lane has the spike trap on the floor, plus xbows to hot the enemy. All the traps are in yellow color.
Not sure if it was conveyed properly, that the enemy will die in the fire eventually at the end. The player's goal is to make the enemies reach the end with as low health as possible for maximum pain to the enemy (basically, make them suffer more without easily killing them). You get extra pain points for doing this.