The visual style of the game is really cool, and the music fits well! I like games that employ "hacking" mechanics -- I would have liked to see more complexity in that part of the game, but also understand that that would probably alienate a lot of players. I also really enjoyed the use of particle effect feedback on the buttons!
My critical feedback is that I needed more rapid feedback in the battle scenes after selecting my action. When I selected my action (hack, firewall, overload), the game paused for multiple seconds before I saw anything actually happen in response. Initially this was confusing, it seemed like the game was asking me to do something more before it responded to my actions. It would be nice to have 0 delay, to decrease time-to-feedback, and also make it possible to run through the battles faster.
I would also like to see a health Number displayed somewhere, instead of a sliding scale