Excellently crafted. A bunch of the tiny, almost invisible details you put in the game really give a lot to the whole thing when summed up. All of the Boss’s attacks were amazingly telegraphed (though, that one spin-the-lazor attack can instantly hit the player in an unfair way at startup).
If I made any complaint over the boss, it would be how the rockets just disappear into nothing instead of, maybe, exploding or fading. Other than that, great!
The lack of any sound effects or particles was a little jarring though.
Also, bugs…first off, sometimes the boss just stops working when you reach another phase. Not sure why this occurs. Also, if you place a turret directly at the far end of one side of the room, and teleport to it, then you go out of bounds (infinitely falling).
Anyway, great submission. Thank you for sharing.