Some feedback:
Charger AOE seems like it's way too high?
Something that could make sense for scaling up AOE and number of asteroids is zooming out the screen as you progress through areas.
Also, the ideal strategy tends to be sitting in one spot spamming if you can't one-shot things. Maybe an upgrade that increases based on the distance you move (scaled down by zoom out and capped at like 1/3 screen so it doesn't go crazy)