There are hardcore and talented game fans that can create some remarkable stuff. The most recent fan created project I ran into is a remake of Metroid II for the original Game Boy. There is a playable tech demo, but if you’re lazy there are plenty screenshots and videos.
I’ve never played Metroid II, but I know this remake isn’t staying very true to its source. Is that a bad thing? No. I’m pleased with the re-imagining — it’s like Metroid: Zero Mission. I tried the tech demo and it was brilliantly smooth, controlled great and captured the Metroid spirit well. There were tiny imperfections here and there, but it’s a tech demo.
I hope the developer can finish this game. I really do. Hopefully the Nintendo lawyers will lay off.