Status: Base Game was finished, same as most achivements achievable with bots.

About: Free game. You play as 1 out 4 Marines in missions swarmed with alien bug like parasites. Need to kill these aliens. Possible to play with bots.

Pros:

• As been said it's free,
• Possible to play with bots.
• Big arsenal to select from.
• Different enemies presented.
• Progression system.
• 7 missions to play and each of them could be selected via console.
• Difficulty settings. Difffuclty affects game in advanced ways (more and more diverse enemies starting from first level).
• A bit dynamic and quite tactical. Require some thinking, when playing with bots.
• Short to finish, but seems to take way longer to get all achievements due to possible fails.
• Good performance, relatively low requitements.
• Seems to be stabile.
• Don't remember any bugs (not insect one).
• Low weight.
• Most achievements could be achieved with bots.
• Some achievements are interesting.
• Has some plot.

Mixed:

• Graphics and design are ok. Physics a bit present.
• Level design is fine. Harder in later levels.
• No Workshop. No Cards.

Cons:

• Plot/story almost don't exist.
• Hard with bots above 4th level to the point that I couldn't finish last mission for long time and which makes big arsenal quite small.
• Small parasites could kill in seconds, can't be taken off and require medic assistance and/or special armor to counter (bots can't use this armor electric potential).
• Big armored bugs in tight areas.
• Big and small spitting bugs are hard counter to bots.
• Bots are not the smartest and sometimes get "stuck" in some areas trying to fight bugs or just for unknown reasons.
• After progression is completed there is not much things to do.
• Manual reloading system seems needless - distracts from shooter gameplay and makes you lose ammo clips when fail to reload (but this could be skipped, if to wait for reloading to finish automatically).
• Enemy presentation is not that diverse and not that big in numbers on difficulty Easy/Normal.
• No saving system.
• Audio/music kinda unremarkable and mostly just there.
• Most achievements are grindy and some would probably require people to finish, since bots are not enough for requirements.
• Doesn't show in Steam library after being deleted.

Summary: Interesting game, especially as it's free to try, but playing last missions with bots could be annoying.

Status: Almost Finished. 1 grindy achievement left, which I probably get soon and few which require people, I probably won't finish at all.

About: You play as 1 out 4 Survivors (8 characters) in zombie apocalypse. Need to survive futher, because why not. Ability to play for Zombies presented among Modes.

Pros:

• Has some plot.
• Interesting Modes like Versus.
• Fine and engaging AI, which could be severly improved with same mods to the point that bots could finish campaign on their own.
• A lot of weapons (melee and ranged). Few items.
• Few unique enemy types and regular hordes. Mini-bosses.
• Good and addictive time killer.
• Quite diverse maps in big amounts.
• Diffiiculty settings.
• Easy to learn, hard to master.
• Very dynamic. Require some thinking. Tactical.
• Pleasant visuals and graphics.
• Like audio and rare music.
• Good performance. Relatively low Requirements.
• Good stability.
• Has Steam Workshop with many mods.
• Cheap, especially during sales or/and with bundles.
• Most achievements could be achieved with bots.
• Some achievements are fun and interesting.
• Has Cards/Badges.

Mixed:

• Enough time to finish all campaigns. A bit too long to get all achievements due to grinding factor.
• No saving system, but game kinda doesn't need it, since MP oriented.
• Not a lot of bugs, but there are some abusive mechanics, if I remember it right.
• Very restricted arsenal/item capacity.

Cons:

• Some achievements are too grindy.
• Could be frustrating sometimes due to how some gameplay aspects work.
• Takes quite a bit of space.
• Some achievements require people to finish.

Summary: Very solid game, but must admit that I like to play for Zombies, rather than for Survivors, since gameplay for Survivor side is partly your typical zombie shooter.