When the bugs that gather up uranium for the reptilians are added into the game, you can make it so that the uranium will slowly kill them off, because I don't expect the reptilians to give them any protection (since they are slaves).
This will make uranium gathering a little bit more challanging (because from the start it is a precious resource) but it will also make it more interesting since you have to make sure you don't let them die. This could be prevented by adding a new building that heals them when they are damaged.
The same can be done for the other types of bugs, but instead of radiation poisoning it will be exhaustion from too much work. The same building that I mentioned above could let them rest before they continue gathering (or perhapes another building).
Hope you like this idea.
that make sens but it could be hard to programe
but can be like it
if a colonist live near to a nuclar reactor or a radioative site they
can lose hp or the energie begin to less
or can mute in a zorlag or a reptilian
Well, Zolarg kind of look like roaches to me, and roaches can live through an atomic bomb, so they would be the most resilient to radiation.
I was thinking along the same lines when I was thinking about a new world type, the blast furnace. The blast furnace is basically mercury. It's surface is pummeled with radioactive solar wind as it turns at 2 mph like a slow cooked rotisserie chicken. Any living thing found on it's surface will be cooked inside out by the immense heat and radiation that they would be exposed to. However, with the use of powerful magnets that use large amounts of energy, the player can reduce or eventually deflect the radiation from a certain radius around the magnet. As the player builds up their colony and gains better resources, they can build better magnets that further reduce the radiation in bigger radiuses. And then eventually they will get buildings that consume iron and uranium to fill the core with molten iron and create a planetary magnetic field that would be permanent. On top of that, the player has to get the atmosphere up to 5 million in order for it to support life.