I really love RimWorld. It's a game I waited too long to play because of the price tag, and I am not usually that into colony management games in general. However, a friend heavily recommended the game for me, and now I am stuck! There aren't that many games that I can call "forever" games, or games I will come back to constantly like Terraria, but RimWorld, if anything, has enough content to last you for a long while depending on the kind of gamer you are. I strongly recommend you give it a chance if you can!
Overall I did enjoy Genopanic, and think it's a charming small indie game. It is a rather short experience that clocked in for me about 2-3 hours, and personally I like games being short and sweet experiences, rather than being bloated just for the sake of increasing its length; so I didn't find an issue with that. The developer has promised to add a bit more to the game, or at the very least the missing ending (and currently un-achievable achievements), so hopefully they do that soon to make it complete!
I thoroughly enjoyed my time with Decline's Drops. It is fun, challenging and has a delightful soundtrack. Its asking price might be a bit high, but honestly for that price you get a well crafted hand drawn passionately made platformer, that will last you easily over 5-7 hours (depending on if you try to 100% it), and the mechanics are deep enough that I could see speed runners enjoy it a lot. Honestly isn't that everything you would want from a good platformer?
Personally I found the potion making process to be the most fun part of the game, and I do hope that the developers keep on expanding on that idea for a potential sequel or other game. That being said, the game just doesn't feel fully finished. Don't get me wrong now, there is a full game there with a start to end, and with content to justify its asking price. However, as much as I like the cell shaded look of the game, it just feels a bit "off." The more I played the more it felt like the game needed just a bit more time on the presentation side of everything (in particular the eerie animals in town). It would also not have hurt to have more music in the game, as it mainly has one song on a constant loop. After a few hours it becomes fairly grating to the ears.
Core Keeper is a surprisingly deep and satisfying game to both new and older players of the genre, and it has something for everyone. You can also play up to 8 players in one world and divide up the tasks. Its not unheard of that you have one dedicated to base building, while others explore and gather materials etc. I have fully enjoyed my time with the game since the start of early access and will come back to it similar to how I always eventually do another playthrough of Terraria.