Populous 2 is a classic, but this "enhanced" DOS edition is by far the worst version of the game. Not only are the "improved" graphics weird and creepy, but the game runs slow as molasses. By all means, buy it on sale for the license, but then go to the internet archive and download the prior DOS version. It runs fine in DOSbox or any other DOS container. Or use the Amiga version, it's also easy to get your hands on. Either way the game will run MUCH better than this version does. Not sure why GOG is selling only the very worst version of this game, but it's weird.
Startopia is a fairly addictive game, but sadly the content creation tools are a bit baroque and so there are few player-created scenarios which work correctly -- and not that many to begin with. Mastering the included levels will take a few days' spare time at best, and you'll get a couple more days out of the working contributed maps out there before you're just repeating yourself. It's still a great game and GOG is asking very little for it, so it's still well worth buying.