Is this available (or will it be) as a physical product?
It will be, yes! The plan is to send Harvest and Grand Guignol (the sister game it crowdfunded with) to the printer at the same time once they’re both out in PDF, and the Grand Guignol PDF release is so close now.
Right now my best estimate is early-mid Q1 next year, but it could be sooner if the stars align.