Soo good guys, nice work!!!
I also hit the crash the first time I used pushback on an enemy. The Let's play is a great idea to get to experience the rest though.
The mood was awesome, the dialog was simple, but resolved, the music built well. The level layouts did a good job of giving you sneak peeks of points of interest ahead.
If I can offer any critique, waiting for all the enemies to move in series was a little rough when there are a lot. At first I thought it was lag. Only alerting enemies within x spaces of the player (and then alerting any enemies within y spaces of that enemy to keep your groups together) is one possible workaround.