Before your Out There Somewhere map that I put up two days ago, the most recent PC game maps put up are of Axiom Verge, a 2014 game that is also on PS4. Like Out There Somewhere, it's inspired by Super Metroid, though Axiom Verge seems to be even more so. Anyways, I'm guessing you didn't notice that, because that probably would have cleared up doubts about whether I would accept maps for Out There Somewhere and similar games.
New games with a retro aesthetic that are also on the PC (many are certainly available through Steam) are certainly doable by taking screen captures and stitching screenshots together. More so if there aren't parallax foreground and/or background layers, or if there are they are easy to edit/toggle/hack, etc. In that case it's no different than mapping emulated console games from the era these new but "retro"-styled games are trying to call back to.
I mean, that's pretty much a given. Just don't assume that I have something against new games, I really don't, and have never said so in the context of VGMaps.com having maps. In fact, I think it's great if we could have more new games and would encourage them! I feel like VGMaps.com would only appeal to an increasingly older and smaller crowd, as we now have an entire generation of gamers who haven't experienced the 8-bit and 16-bit generations who probably wouldn't appreciate VGMaps, or at least not as much.
Among my friends, I'm probably one of the few that appreciate old games and still keep up with new games. Many gamers I know seem to be either stuck in the retro eras or only play what's current. Of course part of it is having the time, and for some reason I feel like I keep having less of it, I've only recently gotten into the "owning games I don't have time to play yet" phase. I never could play everything but I always used to be on top of everything I did want to play and would finish something before the next big thing comes out. Ah, but now we're going off topic.
Anyway, please send in maps of new games! Especially anything that needs more attention or is bound to be a new/modern classic.
Given the ridiculous Undertale hype the past half-year or so, I'm actually surprised I haven't gotten any maps of that yet...