Thank you!
Ah, that fight does have a lot going on. The only way forward is to defeat it!
The heart does regenerate, and the regeneration gets faster the more damage you took, so don't hesitate to stop shooting and focus on evading if needed! You can also spend an attempt or two just observing the patterns to better figure out how to dodge them, nothing wrong with that ^^
I am planning a bit of rebalancing / better difficulty settings in the future, but currently that's the only way...!