Best one of the jam I've played so far, my only criticisms would be that you don't have a view of the level to start off the first time you run through it, and that your options to survive and escape are a little bit too RNG heavy, especially in the later levels where you get swarmed quickly and can create only limited options.
Otherwise, nice and juicy, with great sound effects to sell the experience and create a gunslinger feel. Reminds me a lot of Westerado's sound effects and feel. Excellent entry.