Whew, finally finished level two. I have added a projectile splitter, lightning trap (wich you can see in action in the screenshot) and the upgrade mechanism.

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The splitter appears at regular intervals at a random intersection. When it gets hit by the player’s projectile, it fires two new ones in the directions perpendicular to the direction from where it got hit.
The lightning trap fires once every eight seconds and when you happened to get caught in the electric arcs, it’s kaboom! It makes a cool crackling sound, kinda like a Jacob’s ladder (the experiment with the climbing arc between two rods). The upgrades in this level are double rapid fire (rapid fire in two directions), solid plasma (plasma pierces enemies) and slow enemies.
I have also decided to reduce the number of levels to three instead of five. This is my first game with Torque Game Builder and was for a large part one giant learning process. Although everything works as it should, my code is starting to get quite messy. Also, there are a lot of things that I could have solved in a more elegant way but that are too difficult to correct now. I’m afraid that when I’m making this game too big it will turn into a nightmare. I like the way it is now and I don’t want to ruin it by being too ambitious at this point. This means, one more level and then I’m gonna finish the game.