Really impressive, the tutorial guy was great and the primary gimmick with the chamber was such a good hook. I love the balance between keeping track of the enemy and your current bullet wheel, hoping that you continue with this!
It would be great if the player could have a visible stack of the bullets on screen that will be coming in next, a bit like a tetris piece preview and then could deliberately discharge/reload their weapon the right order to setup the barrel contents.
Spider boss fight was great, and I spent far too much time looking at my barrel and then walking into hits. Good stuff