Here's a script for a bacterial mod, Ahem:
BCTR - Basic bacteria, your starter in the mod, found in the special menu, they turn to BCTW.
BCTW - Bacterial Wall. They do majority of the keep-the-colony-alive stuff. They can make BCTD, ABCT or when submerged in water they'll turn to AQBC. They grow rapidly with CO2
BCTD - Decomposing Bacteria, these turn PLNT, ALGE and WOOD into ash, especially wood. They usually stick and spread and build more bacterial wall.
ABCT - Airbourne Bacteria, these are released by the colony either randomly, by a separate part of the colony with airbourne bacteria mainly or when submerged in any liquid. They turn ASH and OXYG to CO2
AQBC - Aquatic Bacteria, these are released either randomly or when a colony is in water or on water, they travel downards in the water forming a layer, when they're 1 px only they float up, they build BCTW at the surface, it's best to put some oil for it to grow easier.
ASH - Simple, light, flammable powder, gets turned by ABCT into CO2. Turns to Oil, Smoke and Dust when under pressure. Floats on water.
CSNW - Carbon Dioxide Snow, produced when DRIC is hit with high pressure, behaves like normal snow but turns to carbon dioxide, also as slow as dric. Artificial food for bacteria if you will. Don't put too much.
ALGE - Algae, multiply in water, edible by BCTD. Turn CO2 to OXYG over time.
He or she is probably working on it and, when they're done they will post the link to download the mod. In the meantime be patient.
As immune said, you simply copy the script, put it in an empty lua file, put that file in your scripts folder in tpt, then you restart/open the game, go to your lua mod manager, go to local, enable the script and badabingbadaboom you have yourself a mod.
He, and the script is on the page what ar eyou talking about, it's released already.