If your PC is having a little trouble with this one you can adjust the resolution and whether or not it's windowed or fullscreen by using Command Line Arguments for Unity games.
What I usually do is just create a shortcut to the games .exe file, right click it, and go to the target box:
At the very end of that after the quotation marks put in what you are wanting.
-screen-width 1280 -screen-height 720 -screen-fullscreen 1 -screen-quality Medium
You can change the resolution to pretty much any valid resolution recognized by Unity. Just change the 1280 x 720 numbers to whatever you need. I tested this game all the way down to 800x600 and there didn't seem to be any problems.
-screen fullscreen 1 is fullscreen and 0 is windowed.
The screen quality can be changed too but I'm not convinced it's working for this particular game. I think the different qualities have to be enabled in the Unity Editor first before it's compiled by the dev but I may be mistaken. It doesn't really hurt anything to try it out and see though.