You may have achieved the right balance in your bullet hell game when the comment:
this [beating every level without getting hit] is probably the easiest impossible achievement on Kongregate
appears within five minutes of:
this is, quite literally, the bare-bones minimum of shooting games with nary a crap given if it was even playable or not
I must admit it is some BS to have a boss (5-3, stage 3) that can shoot from (not just at) any point on the screen, including exactly where your ship is, so you need to already have seen its entire attack pattern to not be sitting where a bullet is about to materialize. Although, if my military had the ability to shoot from inside our enemies’ ships and bodies, I would totally exploit that.