PaterAlf: I think the game will stay on Itch.io. This is from the FAQ of their Kickstarter campaign:
"The alpha is the game!
So if you have access to the alpha you will also have access to the final game. You will not lose access at any point. We will continuously update the alpha every 4-6 weeks and eventually the alpha will be finished and become the game.
So to get access to the game just back the campaign at the 'Resident Visa' level or above and you're all set! If you want earlier access to the closed alpha already be sure to back at the 'Informal Collaborator' level. :)"
https://www.kickstarter.com/projects/inbetweengames/all-walls-must-fall-a-tech-noir-tactics-game/faqs Yeah, I read that FAQ entry. But then there's this other one...
If I back at the itch closed alpha level, do I also get a Steam key?
Yes! All our reward tiers include all previous rewards, so everyone who backs for any tier above Resident Visa will get a Steam key.
...which, coupled with some rewards descriptions...
Pledge €13 or more
Resident Visa
Welcome home citizen! You'll receive a key to the open alpha on Steam Early Access once it becomes available! You will also receive some fine high definition digital propaganda wallpapers to gaze upon dreamily while waiting for the game!
Includes:
All lower tier rewards!
Early Access Open Alpha Steam key! (once available)
HD Digital Wallpapers!
Estimated delivery Sep 2017
-----------------------
Pledge €18 or more
Informal Collaborator
Welcome to our ranks as informal collaborator! You will receive exclusive access to the closed alpha and closed alpha forum on itch.io as soon as possible in May! This will be much sooner than the open alpha release. Your name will also appear in the credits as Informal Collaborator and you'll receive a digital personalized Informal Collaborator ID! All previous rewards included!
Includes:
All lower tier rewards!
Closed alpha access on itch.io (Kickstarter exclusive)
Closed alpha forum access (Kickstarter exclusive)
Your name in the credits! (Kickstarter exclusive)
Personal digital Informal Collaborator ID (Kickstarter exclusive)
Digital Original Soundtrack
Estimated delivery May 2017
...made me think that itch.io will host only the closed alpha and nothing more.
But then again, we can read this in the
Risks and challenges section:
As we’re a self-contained team, we don’t have too many dependencies on external organisations. However, we do rely on marketplaces such as itch and Steam to host and deliver our game. While unlikely, unforeseen changes to these platforms may cause complications for us.
So I don't really know what to think. I'd ask them directly, but I don't think I'm gonna back this project even if they unambiguously promise a Steam-free & DRM-free version, so I won't bother. :P