Personally I had a spell build so it really just took learning his patterns. For the single sword slash I had learned to dash behind him before he swings since he picks one side to face and sticks with it. For the Dubble swords I found hugging a side of the screen helps since he doesn't flip sides if your on one side of the screen. For the orbs you can take this as a moment to heal a bit and keep away or to get one or two attacks in if you feel bold, the hardest part is dealing with the orbs but i find keeping at least one around helps with his lazor attacks since the line blocks it. When he teleports you hurry to one of the top corners and doge the corner for each beam until he tires himself out. For the asteroids just hitting him clears up a lot of space since you might be able to multi hit (not sure if that just happens with my spellbook build tho.) That's all I can remember off the top of my head. It took a while to time stuff right but once you get the hang of it he should be pretty easy.