A Very Nice Idea indeed, but there are a few problems:
- Since the game is taking 2d slices of a 3d environment, it can be very easy to get distracted from the upcoming platforms and get trapped between the viruses
- There is no upgrade/Power system. You've only got a weak, slow reload bullet, that cannot even kill the enemies on time.
- I suggest having checkpoints where you can either upgrade something strong, or get a permanent weak boost
- Also, if you want to keep this unique style of 2d of 3d, consider making the player being able to move in and out of the computer. the game currently only continuously goes in.
Otherwise, a very good game :D