Thanks!

The game actually runs in 3d space - I'm pretty sure I never commented out zooming the camera in and out with the Q and E keys. When a level loads up, a vertex buffer gets populated with textured cubes. I put the whole game together in about a day and a half - so, there's still a ton of room for optimization. I'd like to add a bitmasking function to optimize the level geometry and right now entire levels get loaded into the vertex buffer all at once (the original intention was to only have a playable area worth of level chunks live at any given time). The included levels are just familiar test levels that I could mock up quickly, but new levels can be made in a text editor and the game should load them in on startup, if anyone wants to try. The long term goal with this would be add an option to load custom textures (internally the game already has support for high res textures, I just didn't have a chance to setup loading external .png files) and a visual level editor.