Did the firing sound bother you or is it the impact sound from the shots?
Do you mean we should speed up some of the slower enemy bullets?
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I've just given it another whirl and I think it's actually the enemy ship spawning sound rather than the firing noise that's at quite a high pitch.
Yes to the enemy bullets, it just feels like some of them move quite slowly in relation to the player - worth experimenting to get pace vs difficulty. Perhaps faster bullet patterns but more waves of them? Just a suggestion to experiment with perhaps?