While the original Supraland isn't on Linux (yet), Supraland 2 is coming and it's currently crowdfunding to make a bigger sequel to the very highly rated first-person metroidvania.
The campaign doesn't really give the best idea of the actual gameplay, as it seems it's largely assuming you already know the first game. It's basically a big play area, full of puzzles, things to combat and this is going to be more of the same with a brand new area and improved combat.
The developer is clear about platforms too, as listed on the Kickstarter campaign:
(Playtime approx. 15-30 hours, Release Date approx. 2021, Platforms: Steam, GOG, Xbox, Playstation, Nintendo, Linux, Mac)
The funding goal is a reasonable €20,000 and with 31 days to go they've already raised over €5,000 so it should do rather well. I also like how clear they are about going exclusive to the Epic store, with the FAQ page simply saying "No.".
As for a Linux release of the original, I spoke to the developer personally about it. They replied with a very clear "Yes, soon." about a Linux version which is great news.
Check out the Kickstarter here.