I thought this was a pretty neat puzzle game. The player walks through a randomly generated maze, trying to collect as many gems as possible while avoiding the deadly ammo things. The engine is designed so that the player leaves behind a trail of solid wall; this keeps you from following the same path twice.
Backtrax is just fine as an engine, but it would be much better, like Commodore said, if there was something else added to the challenge. I would have really liked a time limit system; maybe torches could give you more time, and ammo would take away time, instead of health. Another way would be to have an object running through the maze, instead of the player; you could program it so that it would be constantly moving, giving you little time to make a decision.
Still, Backtrax was pretty good, despite its small size. For the unique idea and great programming, I'll give triphEd a 4.
I thought it was good, but to hard. Maybe I'm just stupid, but every time I played the 1st level was unbeatable. :( But the engine works incredibly fast. I can't understand how it works. It was pretty good, but nothing special.
Fun but repetitive. There are no new features introduced as the game goes on or items that could keep it very interesting.
On the plus side. The maze generator looks great! It would probably do better as a dungeon game with monsters rather than a puzzle game. There are just too few features to make it an interesting puzzle game.