There should be a hotkey for the secondary weapon. The "SPACE" key being a bit far from the moving keys if you're using arrows to move your tank.
Otherwise, it's a good game.
I'm starting the game and have yet to start playing.
I love the music of the intro and menu screen. I instantly recognized the main theme of "Age of Wonders II" (strategy game sold in France in June 2002).
I hope there's no problem using the music of this game.
 "Bubble Tanks Arenas"){kind=icon}
 "Smileys-War"){kind=icon}
 "Battle for Alandria"){kind=icon}
 "The Final Death Wish"){kind=icon}