I had a N3DS, it was my first handheld and it was great! Really good selection of games. My most played were Monster Hunter Generations (which was my introduction to the series) and Fantasy Life - one of my absolute faves, a charming and colorful fantasy adventure with life sim elements. The story is a bit meh but the gameplay loop is incredibly satisfying and there’s nothing else quite like it. I’ve been replaying it on an emulator (rip Yuzu/Citra devs) recently and it’s still a blast.
The 2 hour refund window is for automated refunds, you can still make a request if you’re past that - it’s just going to need a human to take a look at it. I’ve once succesfully returned a game I’ve played for about 5 hours because it had game-breaking bugs and ran like crap for no reason, and it got accepted within a day without an issue.
So Helldivers owners have a chance. I’m assuming that Steam’s Customer Support department is having some kind of an internal discussion right now on how to handle this case.