Where I'm at, visually

Just thought I'd share this. Here's what the book helped me do:

The code for generating the weapon upgrades (green cubes that the character picks up) is created through Kismet (you can see Kismet talking on the left). The enemies all have states, and change color when they change states (red for seeking, green for attacking, blue for fleeing). The big one at the end is the boss, in his first phase (10 < HP <= 30) he generates more minions, in his second phase (0 < HP <= 10) he just shoots rockets.

First thing on the to-do list: improve the aiming. Not knowing which way you're facing makes it really hard >_> Second thing, those smaller enemies that go really fast, well, they're really annoying... and sometimes too frequent (right now they have a 25% chance of being spawned). Tweaks to follow.