Mine has to be Dragon Quest: Rocket Slime, a DS spin off of the Dragon Quest series that sees you playing as a slime operating a tank and rescuing the people from your town. You run around the overworld, collecting items to use as ammunition and saving money to upgrade your tank. The art and music are just as great as you’d expect from the Dragon Quest series. It made fantastic use of the DS’s dual screens. It’s also written for a younger audience, so a lot of it is just really silly and fun! Try it out for sure, I’m so sad there’s no sequel :(
Dwarf Fortress, Less now since the steam release
First started playing that back in 2013 or so, after an Ars Technica article. Amazing game, I come back to it every now and then, but my shenanigans always kill my fortress with low FPS
Luckily they hired a developer who is the only person other than toady who has properly looked at the code.
They are adding multi-threading, not to all tasks but a few so we should start seeing serious performance improvements.
Putnam (The new dev) has already made some great changes, especially when it comes to performance.
Would definitely check it out again with the steam release.