Its because of DJCoverthis. Its so dumb. I usually keep my game volume on obs a bit lower so it doesn't get muted when i run z1. Hope that helps you!

Couple tips i learned from speedrunning: There can only be 1 fireball on screen at a time, so if you dodged one, you can get one or two stabs in

Also, gleeoks hit box is skewed to the right of his heads. That should make it easier to aim

Lastly, if you get one more heart, you can get the white sword to make it easier. Its It's 16 hits for the two headed gleeok with wooden sword (10 for first head, 6 for 2nd) , but only 8 with white sword (5 for first head, 3 for 2nd)

Good luck!