The keyboard bug is fixed (in 1.3) which will be uploaded later. It's not really that crucial right now since the only time you'll need the start button is to JOIN a game. (dunno if player 1 ever needs it..)
The side-arm system will be completely redone (featuring different levels, and a charging meter) for later versions, since it's now pretty worthless (at least the blue ship's side arm).
The hitbox is... pretty small, but it's different for ships. If you check the monitor while you're changing character you will see an arrow that points to the hitbox, however this didn't turn out as exactly as I wanted it to. But anyway, the hitbox (for bullets, mind you) is located at the COCKPIT (i.e at the forward part of the blue ship, and a bit more backwards on the red one) and is something like 4x3 pixels (maybe a bit too big after all ...). This will also be taken care of in the full version (or another demo version), for example it could be pulsating (is that a word? my english is poor ) in some color when you hold FIRE.
Also the hitbox for colliding with other aircrafts/tanks/powerups/etc is a lot bigger.
There's no bullet-scratching/teching/other word in this game, but you DO get a bonus for "dissolving" fresh bullets shot by enemies. (all bullets shot by an enemy that've lived for less than 75 frames). Read more on the scoring information in the readme file.
Kikaru: It was me . n/p. Glad that they could be of any use.
oh.. and music being annoying?? Come on! It's freaking great . But if you don't like it, simply turn it off in the settings menu. By the way, love your avatar