The dropper

Spikes are coming towards you and you need to dodge them. Push left or right to move to the side, push up to slow down, push down to speed up. Push 0 to toggle between the white background particles, it may take between 0.5-1.5 seconds to work.

Tip for gameplay: Don't turn away when right next to a spike, because the hitbox rotates with your character, and may cause you to die.