I made some speedrun videos about the game Null Gravity Labyrinth For example this one

What is special about the game is that every level has many different paths to solving it so finding the fastest way is really difficult Also there are a lot of portals that bring you to new places and you can enable new paths and form the labyrinth

Would be nice if someone else wants to compete :D I will try to add the game here if it is completed, at the moment only 9 out of 12 levels are playable