Fantastic gem of a game...
I understand you said you are not actively pursuing the ability to let people transfer their saves but I will be honest: I was not planning on purchasing this game but upon trying it out I got.. addicted. I thought it would be an hour tops for me but got addicted to collecting the updates, getting the achievements, beating the 30 minute mark.
I put several hours into the game and although I can restart I'd prefer not to lose my progress. Would really appreciate some sort of transfer mechanic and I will happily purchase on Steam - I feel others may be in the same boat as well.
Regardless of whether you will implement this or not, once again, highly addicting and amazing game; kudos!
Edit: Addiction prevails; bought it and restarted. Did not take long!