I have never been so relieved to finish a challenge on here before. Not because it was hard, but because THIS game is so god-awful terrible in design and such a bad attempt at a cash grab that just sitting down and playing the damn thing SHOULD have been the challenge itself. This is definitely close to rock-bottom as far as challenges go.
To those having trouble only seeing about a quarter of the screen when you first start up the game, this is the method I used to fix this until the dev patches it. Right click on the gray area on either side of the screen and select "This frame". After that, click on "Open frame in new tab." This should allow you to play the game in a new tab with the screen properly sized in the web player. Hope this helps!