The developers of Puzzle Puppers [Steam, Official Site] have stated that a Linux version will be bumped up the list if there is real interest.
It was pointed out by Cheeseness on Twitter and the developers have pinned the Steam forum topic asking about it, so it seems they are pretty serious about seeing interest.
You can let them know if you would buy it on this forum topic. It should go without saying, but if you wouldn't buy it, don't comment on it. Having tons of people saying they will and not doing it does not look good.
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