Microbe War

In this science experiment, 10 microbes battle for control of the petri dish. Whenever they reach a certain size, the scientist will take half of their mass as a sample into a test tube setup where it will mutate a new ability before being returned to battle.
Cells automatically spawn food over time. Microbes eat food to gain mass, and constantly lose mass over time.

Upgrades available:
Spikes - The microbe grows spikes that will deal damage on contact with enemy microbes.
Pull Food - A forcefield will pull nearby food towards the microbe.
Split - Reduces the mass threshold required for the microbe to split again.
Faster - The microbe moves faster.
Less Drain - Reduces the percentage of mass lost per second.
Chase - The microbe will steer towards the nearest enemy microbe, it also gains some damage when touching enemy microbes.
All upgrades increase the amount of mass required for the next upgrade.