You might want to try posting this in the stickied Bug report post (https://itch.io/t/650889/bug-report) as it will probably get more attention. It seems someone else has posted this issue in there already as well. The developer says that a fix is coming soon, though I'm not sure whether that was posted before or after the 5.1 release. If you're on 5.0 (not 5.1) you might try downloading the newer version, as it seems that there were two releases pretty close together.