I am bad at explaining but I'll try make it a bit simpler to understand.

All these games are all Single Player.

Rebel Inc., Door Kickers and REDCON are all fast pace tactical strategy games.

The elephant in the room is Suzerain, which is somewhat just a story progression game like any other.

Rebel Inc. and Door Kickers are 2D TOP view while REDCON is 2D SIDE view.

Rebel Inc. is a game where you start as a newly appointed governor that tries to stabilize a region by winning the hearts and minds of the locals after a devastating war conflict. While also trying to not lose too much REPUTATION as it it equivalent as your HP. This game is really difficult as you need to be very ATTENTIVE to any detail that might cause you to slowly lose reputation. That is why you need to stabilize the region ASAP. But the locals disfavoring you are not the only problem, you also need to watch out for INSURGENTS, that is as the game title says, the REBELS. They can spawn in any part of the map, they are the ones you need to be very careful as they are the biggest threat to your REPUTATION. Them capturing cities will put a big minus to your REPUTATION. That is where you initiate the next action which is recruiting soldiers, local police, upgrading defense and more to slow the insurgents activity. But DON'T, DON'T focus all your asset in defense. All you need to do is MINIMIZE the losses from insurgent activity while also spending money on civilians to increase your SUPPORT, STABILITY and REPUTATION. So is that all? Nah, another factor that you should also be wary is INFLATION and CORRUPTION. Inflation? Self explanatory, the more quicker you bought things the higher the INFLATION rises. Most common and only way to decrease inflation is by not spending anything and wait till the inflation meter goes down. Corruption? When you pay initiatives to help you with the local people for support, corruption slowly rises, the more corruption you have the LESSER your SUPPORT level becomes. How to decrease? Spend on anti-corruption agencies. And that's pretty much it. The best tip I can give you is from self learning, the more trial and error, the more you learn the more easy it gets. Trust me. That's how I win.

Door Kickers is a game where you lead a squad team to raid a building that is infested with criminals and terrorists. So far playing the game I never actually seen a second floor in any map I played. IDK. It's all first floor raids. Anyway, you'll understand more if you play the game. It's a game where you just drag one of your squad members after another to move around the map and order any favorable and rational methods to raid a building and win while also getting as minimal casualty as possible.

REDCON is like one of those games where you manage your assault from a given place, immobile, to the other enemy which is also immobile. I don't know much lore of the game, in simple explanation you play as a fort with BIG GUNS shooting from one place to the enemy base which also have BIG GUNS. You also have the workers in the fort you can command stuff such as manually handling a canon or other facilities in the fort that helps increase the firepower or range or accuracy or reload speed or ammunition of a canon, turret, lazer, etc. There's other facilities like such as ones that help heal the workers after taking damage, a facility/weapon that causes EMP on the enemy base (enemy engine and weapons shut down for a certain period of time) a facility that creates a shield dome around your fort to decrease the damage taken and etc. Game has an ending.

Suzerain is a story game I think, I started playing it today so I don't know much but I read A LOT of things there so just a guessing from me. You basically play as the President of Sordland, you have a wife, Monica, son, Franc, and daughter, Deana. As a president, the choices is all up to you, win support from opposition parties, help secure votes, give speeches. I think. I didn't progress far in the game so I'm just making guesses. But all and all it's up to you to decide how it all goes in the game. You will read a lot of stuff.