Sundown Syndicate is a charming cyber-western shmup with wonderful pixel art, stellar soundtrack, and classic bullet hell enemies and patterns to hoe down. I loved how the playing cards tied into the jam theme where the player is able to utilize them as both power-ups, and for attaining a good hand for the boss fight, so you couldn't simply just pick up every card that dropped.
I will admit, as soon as I discovered that rooms/stages didn't lock, I cheesed my way to victory by leading enemies back down to the second room and hiding by the door frame. XD I would definitely suggest to have it so that as players advance, rooms lock respectively for each level.
Overall, a very enjoyable entry. I absolutely adored the character designs and pixel animations were fantastic. And the theme songs were awesome!