SpaceDoom now upgraded with Music, Sound, Pause, and better graphics.
This is a prime example of the classic 3 tier tradeoff used in video games:
The laser can destroy many enemies with one shot, but it uses up a lot of power. It is not very good against bosses, and one boss will take most of a laser powerup to kill, but it is easy on the clicking too.
The spreadshot takes a lot of clicking to use: but it does the most damage vs. energy usage of all; It can kill several bosses with one powerup, and is also very good against pawns.
The autocannon is a nice balance between the two: Easy to use, and good against bosses and pawns, but uses up more power than the spreadshot.