A wonderful concept but if the controls were more precise and easier to use this game would be much better. In my opinion, you shouldn't worry about the game's length and increase the difficulty. Game jam games should be short, easy and sweet. They're playable ideas that could be turned into full games, or you could make funny gag games. I could imagine a game like this but with a few more characters, each with their own abilities and being able to see through different illusions and you have to use each of them to help the other. And if the idea isn't sticking, you can move on to the next one. I think this game is really cool and I hope you make more!