I like the overall look of the game the palette is nice and the look is clean. One issue with the graphics was that the enemy projectile color was very similar to the enemy explosion color which made projectiles hard to spot sometimes.The mechanic was cool but I felt like the SUPERHOT-esque effect made it kind of annoying to dodge incoming projectiles at times. Maybe it was the player speed versus the projectile speed but I felt like it was hard to side-step projectiles a lot of the time. Overall I would suggest you tweak the game play a bit to make it a bit easier to dodge.
On a bug related note, they game was definitely not registering W and A for me, but the arrow keys worked.