The run-and-gun felt like a nice evolution of a sort of quick-shot arcade game. It was definitely a challenge, but fun!
I would say that the ammo felt a lot less common than the number of enemies. The game is at good place in terms of polish, so the next thing would be some balance. It seemed like I would run around quite a bit and not see a single chest. But maybe that means I need to conserve a lot more ammo, though it's a challenge when those dang scorpions are so quick with their little feet!