The way it works is there's a hub world that all the levels connect to. In the hub world when you reach a level's entrance (one of the smaller black domes) it sets your time limit in the hub world to that levels completion time, which is 1 second by default until you beat that level. The gameplay loop is basically beat the level your on then navigate to the next one in the hub world, and if you don't have enough time in the hub world beat the level your on faster.
I didn't add a way to reset your progress, and there's not much reason to go back to old levels but you can go back to them manually in the hub world after beating the current level.
Sorry if I made it confusing, I should have made it more clear where you and where to go at any given time.









