Thanks for playing - glad you enjoyed!
When I decided to keep it super simple, I knew i needed a good variety of ships or it would get stale fast. I did consider having some manual input, maybe on the powerups, but ended up leaving it.
The hitboxes I actually tweaked deliberately - I found that the shots could quite easily slip between some of the formations, and that felt annoying in my playtesting so i made it slightly generous. Might have made them too generous, but i felt that would be better than watching your shots clip past. (Also, the shot can still damage during its explosion, so it has inate piercing :))