You can find a few previews on his website. Someone asked on the Steam Forums whether this will become available for sale, but the developers haven’t got back to him yet.
Previews on Matt’s site
– https://www.matthewkilford.com/
Steam Forums question
– https://steamcommunity.com/app/344240/discussions/0/1471967615838032652/
I’ll update this thread if I find anything.