@StalkerNOVA You could try using Comet right now, but it's not straightforward, and it may not work depending on which Galaxy-specific features the game uses.
Open Source implementation of GOG Galaxy Communication Service for SDK bundled with GOG games. - GitHub - imLinguin/comet: Open Source implementation of GOG Galaxy Communication Service for SDK bun...
I don't know if it can be managed on Steamdeck but, from a PC it can be done. You simply install and run Galaxy from the game prefix and start NMS from the GOG launcher or, alternatively, install Galaxy as an Epic game and run it from there. Both ways work on my PC/Mint.
the space anomaly portal has the monthly featured bases, but aside from that, i am not seeing any other players on the anomaly with multiplayer enabled