time for constructive feedback:
-I would recommend to have the player always look towards the cursor, not only when actually attacking.
-Make the level itself more attractive. You could easily randomize some parts on the ground and put some decoration on it. That would massively improve the overall look and feel
The game mechanics themselfs feel very good. Nice fast paced game :)
Yeah feels a lot better in my opinion. You work with Unity? If so, add Controller support (dual stick) and make a mobile version with adds. Just one day of work and you have a fully finished game, making Add revenue ;)
I personally would make the difficulty raise a bit more shallow...but I am very bad at bullet hell games, so I am not the key audience :D