Old World has its moments, but it's a very niche offering. I wouldn't recommend it to someone who isn't hardcore about 4X games because the learning curve is brutal. However, if you've played the rest and you're looking for something new, and especially if the overload of stats is something you find compelling, check out Old World. At the very least, you get to enjoy Christopher Tin's majestic soundtrack.
All in all, despite Might & Magic: Chess Royale being free to play, I have a hard time recommending the game as anything other than an introduction to auto-battlers or a very casual experience to distract a few minutes while waiting in line. It's overly simplified and displays little in the way of character. With several games of this nature on the market, it's difficult to see how Chess Royale could compete.
At the end of the day, if you feel like getting startled and wandering around a horror atmosphere for a few hours, Moons of Madness will serve adequately. The visuals and sounds are well crafted and immersive. Just be aware that the game itself is mainly a walking simulator with a B-movie plot and some minigame puzzles mixed in.
At the end of the day, I'm not sure what else you could expect from a remaster of Age of Empires II: Definitive Edition. It was a great game in 1999, and it's aged better than most in its class. If you're looking for some solid RTS gameplay, single-player or multiplayer, look no further than Age of Empires II: Definitive Edition.
Darksiders Genesis is a great game. I feel like the developers masterfully ticked every box on their design sheets, so they should be proud of this one. Unless the genre really turns you off or the occasional puzzle is a deal-breaker for you, Darksiders Genesis is definitely worth your money.
At the end of the day, you get what you pay for. It's a pretty inexpensive offering that gives some good thrills for a short time. If the developer released Demon Pit 2 that featured a campaign and some co-op action, I'd definitely check it out, as they have a solid foundation here. The current offering is extremely niche, so if competing on a scoreboard doesn't strike you as terribly appealing, there may be better places to spend your money.
All in all, I think that Shortest Trip to Earth has a niche appeal.
Overall, Age of Wonders: Planetfall is a solid sequel that differentiates itself sufficiently and improves upon the franchise's formula.