I got till the twins before I conceded defeat lol
Great mechanics here. I also love how you built upon them from the first fight and onwards. It took me a few minutes but I got used to them. You definitely need to keep track of a lot of things, but it's still cool for what it is.
I don't think I really need to say how beautiful this game looks lol. But I'll say it anyway. This game looks fabulous. The boss attacks were also well telegraphed in general.
However, it unfortunately affected readability quite a lot. I wish the normal bullets outside of the blue and red bullets looked a little different because they kinda blended into the environment a little too much.
Although I think my biggest problem with the game was that I wasn't sure if I was doing damage to the boss or not. The colour for the boss's health bar is a little too similiar to the colour of the background of their healthbar, so I really needed to squint to see how much damage I did.
Along with that, the audio in general is somewhat weak. Which also affected whether I knew I was doing damage to the boss or not. In other words, player attacks really needed more feedback in general.
But apart from that, this is an amazing entry. Really well done