I made an update and added a change log to the OP. Take note of when an update breaks loading the previous version's saves. I will push a big update tomorrow.
1. Turn down the mutation rate. 70% is just bombarding them with radiation. Try more along the lines of 10%.
2. Expand your food spawns range. Mouse over it, select the range setting, and scroll to increase it to like 3000 at least. Otherwise all the food will just spawn at the same place.