Wow, just discovered this game a few days ago. Incredible animations! Seems some people have difficulty with the mutants in the stone road area before the swamp, so I made a strategy for it.
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No need to burn through ammo - just 1 rifle magazine (29/30 bullets) is enough to kill all enemies in this area! The mutants that spawn from the left don't spawn randomly either - there's exactly 3, and they spawn when you reach certain points in this area. All mutants' walking paths/spawn locations are completely static and therefore routable, so you only need to memorize where they spawn and deal with the semi-randomly spawning flies. The 3 mutants that spawn from the left are at: 0:34 (when walking over the mutant's body), 0:48 (a mutant spawns from the right here also - position to the center of the ^-shape support beam ASAP after passing the v-shape support beam), and 1:08 (when walking over the mutant's body). I'd recommend counting how many v-shape support beams you pass to keep track of your position in this route.