After screwing around with level one I found out something interesting. You dont have to glitch under the gas station to activate the bridge gate. All you have to do is blow up the gas station. You can just die to the explosion. After you die and restart you will walk about 3 feet and then the bridge barrier will open.

This means level 1 with all the glitches should be doable in about 2 minutes.

EDIT: Apparently some folks already know this