Managed to beat normal mode after some 3-4 tries. For some honest feedback, I didn't enjoy the shooting itself that much. I dunno, maybe that's just too much erratic movement for me. And/or a skill issue.
That being said, I did enjoy the upgrades (apps) and found them quite creative and fun. The death mark in particular helped me deal with more chaotic waves. Due to that, getting a mod to start with an upgrade was a huge help.
The artstyle is great, and a bit familiar, with the overwhelming amount of screen effects. However, the thing I liked the most were all the fake-OS things - the desktop, game over console with a bluescreen and such. Some great work there.