Not a bad game by any means, but you're close to crazy for asking $10 for this. The game itself is nothing too crazy, it's more or less a Roguelike clone but a few extra little changes, but the biggest problems lie in your key system. I ran out of yellow keys, forcing me to restart. I played again, being more conservative, but ended up running out of yellow keys once again. You need to work on making sure each map generates enough keys for all of the doors, or provide a way for players to gain more keys to avoid this situation.