Neon Cannon

From Evil Toaster Wiki

The Neon Cannon is the first boss in FT1. It was built by Mapac. It attacks by shooting floating boxes that fall down when they are above you. If they hit you, they turn into a piece of Neon Toast. If you get out of the way they land and act like normal floors/walls. You beat it by getting on top of it(by climbing the boxes that stopped) and d-smashing the piece of Neon Toast driving it. It takes 3 hits to destroy.