I like the hacking mechanic. It's not too simple but not too complicated either.
It's pretty stressfull trying to keep everything active. I think having things active for a bit longer might balance the game out a bit. Also the instructions that pop up at the start are a bit confusing. I think the text might be shortened a bit. They did their job though, I knew how the game works, after I played it for a few seconds.
The graphics are simple but clear and the shader gives a nice effect.