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Pretty fun, very satisfying to hear the gun shoot as fast as I type. One problem I'm having is a sound glitch: it appears only one sound can play at a time. When I shoot the gun, the music has to stop playing so the gun sound can play, and if I'm shooting quickly then overlapping gun sounds cancel each other out.
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Needs to automatically go to pause mode (ESC) when out of focus. Keyboard control in the menu would also make sense, especially considering what game this is. A bit more design (like a backdrop level) would be good to. One could also collide into it, and prevent collision by pressing the space bar. :)
Holding shift (uppercase writing) could switch to another weapon like rocket launchers, and could require one to type abbreviations (like “IBM“).
Anyway, that’s just my ideas.
But it’s nice to see HTML5 games coming into fashion. (I’m writing one right now. :)
(Well, actually it has nothing to do with HTML5, but with JavaScript APIs, like the Canvas object, and works just as well with HTML4, SVG, pure XML, or pretty much anything.)