Ok, I managed to get till the boss. The actual bossfight itself is actually pretty sick.
I love how you also have normal enemies spawning. They definitely kept me on my toes. That said, I think my biggest problem with this game is that you really can't tell whether you took damage or not. Some sort of damage indicator like a sound or screenshake or something would definitely help. This also applies to the normal enemies since it was hard to tell if I took damage from them.
I also thought the actual attack range of the boss wasn't really clear at all. I kept taking damage from his shockwave attack since I couldn't tell how it worked and how I should dodge it.
Still, this game definitely has some cool art and the mobility of the player did feel good to play around with,