Fun game, and I like the shader you used to make the game look like a retro tv. There is definitely a learning curve to this game, I found it very difficult first, then as I play more, it gets easier every time as I memorize the location code and. I think this is a good difficulty balance where player has to learn to get good at the game. If you decide to keep working on the game, I believe more upgrades, maybe special skills, and perhaps bosses would make the game more interesting?