Briternpils: What do you think about alternatives to Frostpunk?
For example this review
alternativemaster.com/alternatives-to-frostpunk I know only two of: Rimworld and Oxygen Not Included. Can vouch for both, despite them being quite different from each other and Frostpunk.
Rimworld is more like Frostpunk, if you disable "invasions" as Frostpunk has no external threat other than climate. In Rimworld you could be invaded/raided by pirates or other enemy factions, in addition to some enraged animals, and, depending on your location, may have to deal with climate issues.
But, to an extent, this is settlement manager, although it will have very tiny population, in comparison with Frostpunk, if you judge by plain numbers. However, if you won't consider every human in Frostpunk, but scale up to particular functions various buildings perform, then it'll be similar. Instead of hunters hut you could have hunter pawn(s), instead of engineers lodge you'll have researcher and crafter pawn(s), and so on. Instead of global morale and hope and discontent you'll have individuals, who will have their own quirks, which will affect pawns behaviour in various ways.
DLC adds "psychic" powers, which, by my opinion, are somewhat OP, as they allow you to generate ridiculous situations and leave rather deadly (or boring) confrontation unscarred. Or turn them into complete mess and die laughing. Especially if you play with single save (won't recommend, sometimes game derps without provocations).
ONI lacks any enemies... Unless you consider your own dupes, who are their own worst enemy, as they keep doing stupid things. Although it seems Klei slowly improve on that.
But, by and large, ONI is about "physics simulation". Not quite like our physics, but more or less consistent within game. Which allows us not only to create self-sufficient colony, but also build various contraptions that use and abuse local physics rules. Because of course we are. And I don't mean just building geothermal power plant that is going to suck thermal energy (and convert it to electricity) out of magma drips, which will be turned into igneous rocks chunks, which, when cooled, will be fed to hatches, which will be used as source of food for you duplicants, no-no-no, that's already a norm. I mean creating contraptions that theoretically shouldn't even exist, but hey, here we are.
Recently there was an addon released in Early Access, which adds basically whole new starting rules, which is fine (and fun), because it makes you leave old, well-travelled ways of colony development and try new schemes you haven't even thought of previously. Some of those new things are ridiculously broken at the moment, only adding to overall fun. More than once I was losing my breath, laughing at situation that were developing outside of my control or understanding.
The only drawback this game has (other than infuriating mass stupidity spikes your dupes regularly perform and general performance loss at huge bases at late stages in base game) is that this game is not represented here, on GoG. Guess it's due to heavy modding present.
Other than that like both, own both, consider them to be about as addictive as Factorio.