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I've just played on an Ubuntu machine. It's a really great demo, congratulations! Waiting anxiously for the complete game and contributing on kickstarter as soon as possible!

I've tried earlier on a Linux Mint, there was the bug. Since linux mint is ubuntu based and a really similar OS, i guess it can be some video card problem. You can send me any build update to marcoaasilva AT gmail...

Thank you! I'm glad that you found a way to get it working and that you enjoyed it! 
I'll keep an eye out for ways to get it working on Mint, cheers!