I actually don't think this one is quite as obscure as you think, since it was given away on Epic a few years ago.
Caves of quid
You mean Caves of Qud, right? 'Cause if that's not a typo it's so obscure that even search engines don't know about it :)
Oh, thought of another one to list here: Micro Mages. It's not just NES styled game, but an actual NES game with a emulation wrapper around it for Steam. You actually get a NES ROM when you buy the game that's playable in all the emulators I've thrown it into. I've actually got a copy of the rom on my 3DS.
The real interesting thing that the devs put out a video about the challenges of fitting their game onto a NES cart (which is actually how I found out about the game). While the game is kinda small, (I think... I haven't actually beaten it) it's well worth the current sale price 99 cents.
Eh, I don't know how well the game is known, but I'll throw out A Robot Named Fight, since looking at Metacritic it seems like it never got much mainstream attention. It's also (unsurprisingly) on sale right now, only $3.24 in the US.
Anyway, the game is a metroidvainia roguelite mashup. The gameplay is more the Metroid side of "metroidvania" being very obviously inspired by Super Metroid. You traverse a randomly generated map, getting unlocks for future runs by accomplishing various things though out that run, think Binding of Issac's item progression.
I wonder what percentage of attendees are actually just press covering the event?
Honestly, that's a pretty nice single wide.
Now I'm picturing trying to conduct a video meeting with a 10-40 minute lag for the people on Mars.
Algaefa this time.
Podunk area of Northern California actually.
It varies, but it’s something like $7.50 to $8.
Really? Wow, in my area it's like $12.
Eh, I guess I toss out one of my favorite DS games as a break from my previous Steam recommendations, so Retro Game Challenge 2, the fan translation of GameCenter CX: Arino no Chōsenjō 2. This actually may get downvoted a fair bit, because the Game Center CX show that inspired the game has a dedicated cult following in the United States and Retro Game Challenge 2 has been played by some fairly big streamers.
Anyway on to the game itself. Retro Game Challenge 2 is a collection of NES and SNES styled mini games loosely bound together by a fairly non-nonsensical meta plot and a ton of nostalgia. You're assigned "challenges" for the various games that you have to beat, think NES Remix if you've played that, it's actually from the same developer. But not only that there's a ton of nostalgic little touches, all the mini-games have in game "manuals" to read, there are also in game "gaming magazines" that offer tips and tricks for the games you play, as well as hinting about "up-coming" games. There's also a "daily challenge" which is a... well challenge that is issued daily, with difficulty that ramps up as you beat them.
The best part of the whole game/micro games is that you can freely play them after they've been unlocked. None of the NES Remix's "We've got the whole game here, but you can't do anything but the challenges" bullshit. You want to play though the entirety of the ten-ish hour NES styled JRPG? Go for it. Indieszero also included some "challenge mode" versions of games from the first Retro Game Challenge game.
Anyway, as the wall of text may have clued you in, I really like this game.