The basic mechanics and controls have been achieved and I have mostly achieved what I set out to do. I wish the shooting feature took less time, but it is extremely accurate now and am happy with that. I have not destroyed bullets on wall collision, but that can be simply fixed.
The graphics are not great, because I was focusing on making the game over graphics. Once I have finish the first level completely, then I will apply better graphics to make the game more understandable.