Its a very, very nice game.
But its very, very buggy.
The W,A,S,D key only got W,A working
When I died once, and start again in arcade mode, I can't play again, it just shows me the statistic.
Well, the WASD keys are not what you use. You use the arrows as mentioned in the description.
I'll look into the 'screen' error, but I have never had that issue.
UPDATE: I cannot recreate the screen error, both logged in and not. I was able to go from STATS back to the main menu or the logged in menu as expected. I'm not sure what you encountered.