Yeah the balance needs more work. This particular demo is meant to test the difficulty level of the game, which I have received plenty of feedback on. A balance update is coming soon ish.
What its not that hard it only took me a few tries to get to the last two fighters but when i got there i was on half health with pretty much no ammo and ran out of ammo before i could shoot them down. I found it is easier when using Keyboard to go into cockpit mode.