Thank you for the feedback! I think the first time we uploaded, it was as a 7zip containing the windows version of the game. We made some small updates and then added a WebGL compiled version from Unity. This version we uploaded as a normal zip file, but apparently it did not contain an "index.html" so I do not think the game plays in browsers. Not sure why those screen errors are happening but we have also experienced those issues.
Unfortunately my friend and I started this game Saturday night so we did not have as much time as we would have liked to develop it. We originally planned for local multiplayer but that would have required a wait time between turns with a black screen. The AI is also admittedly extremely basic.