Oh, I mean that if you put the top one at the very top, and the bottom one at the very bottom, nothing will ever hit you.
They can't move one up and the other down, they both move the same direction so what you said is impossible unless it's a bug, if it's a bug that lets you do that then send me a video, probably will fix that
The arrow keys and WASD control them seperately.
I will fix that later when i have time
i fixed the problem but the page is not public anymore since the game is a complete failure