It's been a while since I've worked on this, and I've been thinking about making it more customisable.
At the moment, you can write maps in Notepad / Wordpad / Notepad++, but I am thinking of making the graphics tiles importable at run time.
This means I can issue a developer with the game engine, and they can produce the 32*32 pixel tiles to suit their imagination, and import them just as they would a map.
I can also change this to work using the arrow / WASD keys instead, to make it into an RPG style game engine. If anyone is interested, please let me know, and I'll either collaborate on a project, or give you the tools to start you own project if you prefer.
I have attached the Windows and Mac versions, but it is just as easy to make this into a .swf for playing on a web page.
Missions 12, 13 and 14 haven't been written properly, so they are copies of an unfinished Mission 11. I'll work on this soon.