Ok, so while playing this game I found a sort of hidden feature/secret that lets you start of every round with the gun powerup. It is quite easy to do and in this guide I will be showing you the method :D

Step 1: Start a new match as usual
Step 2: Straight away, move the cursor all the way towards the right-hand side of the screen, untl you can only see half of your plane
Step 3: Keep shooting so that you don't get killed by any of the planes that are spawned outside of the screen, and so that you know when you receive the powerup
Step 4: Enjoy! Really that is it!

Please contact me if you have any problems doing this trick as I can probably create a youtube video demonstrating this secret trick.
Enjoy your gaming! Peace ;D