You pulled off not only a game in 560 characters, but a fun one! The fact that hacking lasers sounds like you're hacking through the jungle. Would be cool if you could cram in a timer display so I could get a sense of how long I'm lasting but I get that that's difficult.
You might be able to save a few characters by saving some reused numbers in a variable. I'm not sure how exact these numbers need to be, if you used the same value/variable for all of your instances of 120,124,127 and 128, you could save a ton of space.
I did something like that with the C and Q variables in my submission, Tweet Attack. It makes the collision detection a little wide but it works, and it allowed me to add a score indicator!