I know people have been playing the Steam demo under Linux via their Proton compatibility layer without any issues, so that's a good way to play if you're on Linux - but I understand if you dislike Steam.
A dedicated Linux port is unfortunately not something I can afford to do at release, but might be something to consider later down the road.

Sorry! I really tried shouting from all the rooftops about the SGF, but it seems I wasn't loud enough yet :)
If you follow the game either on Twitter, Discord or Steam, you won't miss the next thing (which is now sign-up for the closed beta!).

I honestly didn't think about doing that until you mentioned it. It might be possible, but I'd definitely have to check with itch.io (I'd have a tier that is basically a pre-order and doesn't give any rewards now). I'll think about it some more, but realistically, I won't be doing anything about until the Steam Game Festival ends.

The safest best right now is to simply wishlist the game on Steam to be reminded of it at release. Once it releases, it will be available both there and on itch.io, so you can buy on either site.

Either way, thanks for being so invested that you're willing to part with your money now for a game you'll only get later! :)

Possibly, but it's not a given - I'll know for certain closer to release.

I'd love to have a native build, but it's really hard to justify the extra development time, and I'm a solo developer - which means trying to keep multiple OS builds working is very hard and a huge drain on my time (learned that the hard way with the Mac build that's already falling behind the Windows one).

But, I hear only good things about Proton these days, which would let you play the Windows version under Linux with little trouble, probably. That's probably the safest bet for getting Slipways on Linux. If you buy it and it turns out you can't play it that way, I'll be happy to refund it.

Request granted :) Lots of people wanted an endless mode, so it's in the works.

In fact, I'll be polling players on Discord soon about their expectations from that mode, since it's a little bit outside my usual design sensibilities (I believe strongly in time/resource limits for better, more "meaningful" gameplay).