Hi Shibey, thank you so much for trying out the game and leaving a feedback here!
It's true the isometric camera view with depth isn't the best use case in this particular genre since it makes tracking every moving obstacles a lot more harder. This is exactly one of the reason why I'm halting development, since there must be a better way in projecting object positions in 3D space for such a genre.
Yes, the 4th level is designed to be extremely difficult but I believe seasoned gamers of bullet-hell genres should be able to strategically earn a high score.
Exactly, the level needs some balancing work done since it's geared for souls like challenge rather than casual enjoyment.
Anyway, thanks once again for the feedback and hope you enjoy the experience.