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 :(
You don’t want to use the Steam version, it is not as up to date as the website version as the one on Steam was basically just lifted unofficially by some random person. It’s a whole thing and the actual maintainers of Warzone 2100 are pretty miffed about it. The repo versions tends to be right, but best to check version numbers.
https://wz2100.net/
Thanks, added the official link