To earn Lagtastic: turn on 3d mode, indie mode, shoot and detonate bomb. It did the trick for me.
Totally worth it - I presume you need to watch "premium content" to the end.
To earn more money, fly over your enemies and kill them while they're under your spaceship. Instatly collected coins are worth more.
Keep this tip alive.
oh, it restores hp only up to 100... anyone knows how to get soundtrack piece just beside the archer in the beginning of 4th chapter? any special skills needed?
Tip: If you want high speed and multiplier, try to *jump* through gates, for example by releasing left mouse key in right time. I reached speeds like 130mph, with good rate of tunnels I suppose you can reach even more.
This reminder - "but higher max level, blah blah" - should be deleted or able to be closed by pressing space. I hate to reach out for mouse when I'm playing with keyboard.