My browser cannot run this game so I switched to another browser.
Anyway, I like the particle effect and the bullet pattern is nice. I just hope there was another enemy bullet graphic beside the red one to add some color. A slow button also would be a nice addition in my opinion.
In my first playthrough, I seems to hit an invisible wall in the second phase. Really messed up my dodging. And before I know it, I was surrounded with invisible wall.
In my second playthrough, I realized I'm too zoomed in on the game because I'm using browser I not familiar with. The game become so much enjoyable. I didn't find any invisible wall in my second playthrough.