Really fun demo! I loved having to frantically reload all my guns while trying to dodge all the bullets, and the mechanics around the healing bottles are really cool!
I did find one major glitch when trying to enter a building in the town, instead of going somewhere else, the level just reloaded and sent me back to the town's entrance. Also one of the sneaking sprites (I think it was up-right) had some extra pixels floating above the character at one point, but other than that everything else was really good!