Hello!
Thank you so much for your feedback.
Yes, after the first phase, there’s a survival section where you just need to hold out for a while. After that, the boss would enter the second phase with an updated moveset and new attacks, where you’d have to fight it again.
I looked into your issue, and it seems like a browser-related glitch. This can happen due to insufficient VRAM or heavy GPU load from other applications alongside the game. I recommend checking if hardware acceleration is enabled in your browser and trying to refresh the page. Some sources also suggest closing extra tabs if you have many open. We'll also carefully review what can be optimized on our side for an update after the game jam ends.
Once again, thank you for your feedback and for playing our game!