Where can I find it when it's released?

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I will upload the game to steam and itch.io at first, other stores are planned, like gog.com, but I want to make sure I can handle so many places at once.
Steam Store page: store.steampowered.com/app/717280/Critters__cute_cubs_in_a_cruel_world/
itch.io page (current free Demo): farelle.itch.io/critters-cute-cubs-in-a-cruel-world

What platforms/OS will it be available for?

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I will focus on PC - Windows first, since that is the only machine/OS I can personally test on at home.​

Can I use Controller?

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Yes. Main controls in the game are handled by mouse, WASD and space. Controller is X for jumping and both thumb-sticks for camera control and movement.