This game is famous for never going on sale but it is absolutely worth the full price. I have over 600 hours on Rimworld on Steam so the dollar-to-time entertainment ratio can't be beat. The base game gets a little stale after about 80-100 hours but that's where the modding community shines. There are so many interesting mods on everything from agriculture to xenomorphs.
This was my first strategy game on the family computer that we bought at Costco in 1997, so I was excited to see this on GOG. It holds up pretty well but isn't very challenging once you understand the economic mechanics. The economic side of the game is better done than the combat, which has few tactical considerations. No formations, special abilities, or flanking - the player with more troops with better weapons usually wins. The AI is brain dead in combat so you can block their troops with tankier melee units and just shoot them to pieces with archers who have unlimited ammo. In my opinion the best part of the game are the AI personalities. I still remember them fondly after all of these years. The Knight, Bishop, Baron, and Countess are all fully voiced and have interesting and different playstyles. For example, the Knight favors attacking but is bad at economics and defense, relying on mostly palisade forts, while the Bishop favors huge stone castles and wealth but his armies are mostly peasants and bowmen.
Red Faction 1 was a groundbreaking (pun intended) game for its time. Red Faction II is such a radical departure from what made the first game great that it feels like it's part of an entirely different series. It plays like any number of dime-a-dozen late 90s FPS games. Definitely a pass. Red Faction 1 and Red Faction Guerrilla are the only games in the series that are must play, while Armaggedon is a decent game but not a must buy.