I'm shocked that an indie Mac app that isn't in the app store is trying to get away with selling a $29 license that has no free trial. To Github developers, of all people. Shenanigans.
It'd be one thing if you had an awesome video whereby I could see in this in action. Or tons of awesome reviews from people I respect. Hell, I would pay $5 to try it out.
But you want me to pay $30 bucks in hopes that this doesn't suck? There is too much competition in this market to even attempt this. This developer is shooting themselves in the foot.