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I tried to play this on Linux (Ubuntu specifically) but it didn't open.

I haven't tested the Linux/MacOS builds yet, but in the meantime I think Wine + Windows build should work

I downloaded the MacOS one instead, and that one worked. And nice game, though.

Have you still got this MacOs version?

No. I don't use MacOs anymore.

Maybe the binary does not have the execute file permission? (Check file properties in the file manager.)