Dice roll controls the time interval of the game, I like it. I have two suggestion though. I dislike how the projectiles are just white squares, maybe make a pixel art circle with a bit of colour. Also, add an audio slider so the player can control the audio. I like hearing music when I play games so it was unfortunate that I had to choose between the music being too loud or no music at all.
Besides them two issues, I liked the game.