GameMaker Game - EZRoids

For a while now, I've been looking for a game engine/software that would be easy enough for my kid to use. I tried a few, including the Scrolling Game Development Kit but just couldn't find something both simple and powerful. Then I found Game Maker by Mark Overmars.

From the Game Maker website:

Using easy to learn drag-and-drop actions, you can create professional looking games within very little time. You can make games with backgrounds, animated graphics, music and sound effects, and even 3d games! And when you've become more experienced, there is a built-in programming language, which gives you the full flexibility of creating games with Game Maker. What is best, is the fact that Game Maker can be used free of charge.

After working through the tutorials I wanted to use a game I knew and model it in GM. I chose asteroids, as this style of game wasn't detailed in any of the tutorials I could find. This was done in the unregistered 6.1 version of GameMaker. It uses somewhat crude placeholder graphics I had thrown together, much like the original vector game...