Let me just tell you this its theoretically possible to get all the mutations one one week, if you are 24/7 all the time so yeah the build is bats and lepidoptera if your not that active then get your favorite energy ability to be used such as rush or swarm warp.
Tips for newbies in mutation:
First Mutation (well choose from these two)
Lepidoptera or Bat Mutation
Either way the next one will be the choice left out, Example: Bat first then Lepidoptera
Third Mutation: Rush Mutation or Swarm Warp
It all depends on gamestyle, it's your choice after that it would be a waste buying the other.
Fourth Mutation: Literally anything, if your a swarm warp user, I suggest mutate frequency I might be wrong. If your rush settle with larvae, territory or drone mutation.
Number one tip is to connect all the mutations to one another, the only mutation that has limits is lepidoptera, so go far and beyond!
 "Swarm Simulator: Evolution"){kind=icon}
 "Farm of Souls"){kind=icon}
 "BrainCreator"){kind=icon}
 "Humanity Idle"){kind=icon}
 "Slurpy Derpy Classic"){kind=icon}
 "Greedy Mimic"){kind=icon}
 "Idling to Rule the Gods"){kind=icon}