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.
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Pros
Pro Good sense of scale
The game grows at a decent pace, making your new upgrades feel like a true boost.
Pro Oddly addictive
Once you start playing, you want to keep building your swarm. It's a simple enough game, but balancing your larvae and meat sources, as well as ensuring you have enough territory for upgrading your larvae spawn rate.
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.
Cons
Con No good time to quit
The game never ends...your swarm just keeps multiplying. There aren't any good spots to say "OK, I can leave while I'm ahead", or even "There's no coming back from this - it's time to go". You get hooked, and then there goes the rest of your day.
Con Visually stale
The game is completely text-based, so there's not a lot of eye candy. The most interesting thing to look at are the blue bars, and how they slowly get bigger over time.