update v20170404:
You now have access to a level selector from the Pause menu of the hub. A level is accessible from this menu when it has been finished at least once :

Input icons are now dynamic, they change depending on what you have plugged on your computer.
If you have a controller which type is not properly detected, you'll have the Xbox 360 inputs icons by default (as usual).
In the Option panel, you can choose to force WASD keyboard inputs if the system failed to properly setup it for you :
In Time Attack mode, now when you respawn at the very first checkpoint (level entrance), the timer is reset to 00:00:00. So no need to start a new run anymore when you fail from the beginning :)
We removed the Exit button from the Pause menu of the levels. Now Exit is only shown in the pause menu of the Hub.