While playing on windows, I got a repeated message saying "You'll need a new app to open this discord link". I closed the game and waited for a bit, then reopened the game to verify. It did appear to be your game causing it. I have no idea why Unity would cause such a thing though.
Oh, and your game works pretty well. I had no problems with the gameplay itself. Aside from the strange message, the only thing thing I disliked was the way the instructions are presented. They're not easy to read.