Haven't tried to create a TAS in a while so I thought I'd try a fairly simple 2 player run--Rolling Thunder 2.
Here's a WIP containing level 1:
http://storeandserve.com/download/558933/Rolling_Thunder_2_%28U%29_%5Bc%5D%5B%21%5D.gmv.html
While it certainly doesn't look like it, this is actually a no damage run so far. There's a whole lot of "that attack does no damage" abuse though...
Notes so far:
* Contact with a non-attacking enemy does zero hp of damage but does knock the player back and grant temporary invincibility. That invinciblity can then be abused to safely absorb bullets, etc.
* Absorbed bullets knock the player backwards. If the player faces leftwards, absorbed bullets knock the player rightwards.
* An invincible player can also shield a non-invincible player by absorbing bullets.
* It takes a few frames for a player to draw his or her gun. Once drawn, bullets can be fired on every other frame until the player moves again.
* The goal of level 1 appears to be to reach the end with no enemies in sight. Simply reaching the end of the level will not complete the level if enemeis are still alive.
