I love the Hades-like combat of this game and the controls are wonderful and so are the art and visuals, I love those glows and shaders. But, the second boss moves to fast, it barely lets me even land him a single hit, by the time he stops doing the flash step attack he goes straight to teleporting again, it doesn't let me time to breath. Like yeah, I like having quick reaction times, but that's pretty much near impossible. I think you should Raiju to have a moment in which he is stunned/exhausting or charging to have a little bit of breather and letting the player land some hits, and you could still have those quick combo attacks that you currently have in which he goes quickly between attacks very fast.

Besides that little rant, the game is really good, bosses are well designed and polished, the combat is really good, burst mode is a bit to OP for my liking, but I can see you've made it rewarding for how improbable it is to get.

If you plan on expanding this game, this could be a really good Roguelike/Roguelite. I'd really like to see what awaits this game in the future.