That is the last level of the game other than the dev level and bonus level(There is a level select menu in the main menu). Did you press both buttons at the same time and have both indicators turn green if so that is a interesting glitch that I have not encountered that ill have to look into.
My initial thought is just you were unlucky and whatever you were using to push the button down was just a slight bit too light and that it just barely did not push the button all the way down or the colliders on the buttons somehow got messed up that one time either way a better indicator for the buttons states would be a good thought like a click when the button activates and visually communicate how far it has to go down to activate Thanks a bunch for the feedback I hadn't thought about scenarios like this if I ever update the buttons Ill make sure to keep this in mind and also make sure the colliders/triggers have no way of messing up. =)