Recs.
Updated
Swarm Simulator is a text based incremental game in the truest sense of the word. You start off with a basic resource generation, and slowly build up units that produce other units, all cascading down into producing your basic resource. However, that only scratches the surface. After a while, you get the ability to cast spells, and produce military units. The game scales smoothly and can be quite addicting.
Specs
Pros
Pro Very basic and easy to pickup
There are a few basic categories of resources - meat, larvae, and territory. All of the units you build and upgrade add to this base resource, which makes it easy to follow. For example, drones harvest you more meat. Queens produce drones on their own, which will in turn supply you with more meat. Once you have 1000 queens and a decent chunk of meat, you can use them to upgrade to a hive which will produce 3 queens each second, which in turn makes more drones, which each gather meat. Any upgraded units trickle down the line, and produce just the basic resource.