Simple, fun. I'd love a slightly longer and more complicated (browser) version of a game like this, with a reload button, maybe some enemies that aren't just in the centre of the screen - but I had a good time!
This was a very nice and simple game, quite relaxing while also requiring your attention if you want to shoot the least amount possible to get a good level end result. The graphics are a nice callback to that certain FPS game and its era!
This is cute in an unintentional sort of way