Wow I like this game! Safari on a MacBook. Your questions:
- tutorial is not too annoying; just the right amount
- yes it glitched a few times but not terrible; does not ruin game
- balance I don't know; I only made it past wave 0 (or 1?) but the intro difficulty is just right
- yes I would play more for the satisfying destruction of asteroids - but the controls need to be easier for a trackpad
Other comments:
- Controls are hard. Can you make left and right arrows rotate clockwise / counterclockwise? As a second option for trackpads? And I want to fire with space bar too?
- story and graphics are awesome.
- I think the trailer is too long
- I like that there are high scores leaderboard
Really cool game, yes I would play more of this! Nice work!