Why it's built this way
Bullet hells are about reading a pattern and then threading it with pixel-perfect movement. This one keeps the reading and drops the requirement to thread. Your ship is slow and tough, and its shield absorbs anything that lands on the arc you’re facing. Every absorbed bullet charges your beam. Charge also buys barriers: fixed walls that eat bullets until they wear through, so a patient player can close the lanes the boss keeps using and turn an open screen into a closed one.
The boss regenerates when it goes untouched for a few seconds, so pure turtling doesn’t win; you have to keep trading. Your hull regenerates slowly too. It is an attrition duel, and the side that spends its resources more carefully wins it.
The slow way. Keep the shield pointed at the boss, absorb what comes, and spend charge on walls where the recurring patterns arrive: a right-click builds one where you point, and every wall casts a shadow from the boss that shows you the pocket it keeps safe. A wall harvests charge for you for as long as it lasts, so three or four of them turn the arena into a position you can hold and fire from. Watch shield integrity: it regenerates, but it breaks if you tank a whole stream point-blank.
The fast way. Dash through the thick of it. The shield drops while you dash, but the graze ring widens and every bullet you skim mid-dash is worth almost as much as one absorbed. A grazer who threads the patterns the way the genre intends kills the boss about a third faster than any wall will, takes real hits doing it, and never needs a single barrier.