Really cool concept! It ran super laggy on my machine, but I had fun. I ended up giving up on that level with the green circle, I have no idea how to beat that level because it looks like the finish line is blocked off?
The green circle is a bit confusing, for sure. You have to press "Space"/"A" while in the green circle to activate/deactivate the obstacles. That's how you can reach the finish line. Anyway, thank you for playing!