The concept is a pretty creative use of scale. There are some interesting strategic decisions about when to scale up and down. The game is quite hard. My best score was around 600 damage dealt, but I always get hit by the homing bullets when the waves of circles appear.
For a bullet hell, I think that the homing projectiles move much too quickly. I like dodging waves and patterns of bullets, but these fast bullets hit me before I see them, and they blend in since they are the same color as other bullets and they have no motion trail.
I thought that 'toggle weapon' meant to switch between different weapons, but it just turns my weapon off. Why would I want that? I also kept scrolling in the wrong direction, as I think of up as big and down as small.