I made a small game prototype when I encountered a simple question: "How would an exploration game with no collisions or boundaries look like?"

The prototype has no actual gameplay. Instead, you fly around, and interestingly looking objects manifest themselves as you navigate infinitely (Perlin mapped looping) space. Another thing you can do is to enter a bright light that would drop you into a "secret" world where you'd have to finish a puzzle to acquire some resource or a key.