Thank you so much for reviewing my game. This is loosely based on the arcade game, Empire City 1931. Pressing the space bar allows you to hide behind a wall, to avoid being shot. The downside is that your sight moves.
If you avoid getting shot you get a "Defence Bonus".
If you don't waste a bullet you get the other bonus, it's name evades my memory.
Later on in the game there are crates that you can shoot to get bonuses.