I played Super Time Force at PAX Prime 2012 and I felt it was a heady mix of old-school Contra mashed up with some time manipulation that reminded me of Braid and Half-Minute Hero. This new six-minute-long trailer will give you a real good idea as to why.
Working with each member of the Super Time Force (Jef Leppard is my favourite) is the only way you're going to get through each level. Each member has special abilities that are crucial to making it to the end. If you like the trailer, you can grab the track by 6955 for free from their Bandcamp page.