This game was made to be very simple, and not a full game inorder to teach people how to make games! We're going to be doing some tutorials in a month or two.
Also glad you enjoyed it! We're planning an actual different full game soon that'll be a lot better :D
Sorry about that! It's definitely a major oversight on our behalf. We'll get it rectified for our tutorial. Also if you want to test out our solution that'll be great (since this problem only appears on specific computers).
Darn that's pretty bad still, back to the drawing board. We think we know why now, but we're gonna give it a better test this time. We will keep you posted!