Run around with the arrow keys to dodge bullets and bombs. You can't win, just try to stay alive. The enemy teleports randomly every 3 seconds. I never implemented anything to prevent it from teleporting on to you, so if you want to stay away from it, run around on the edges (I made a 20-pixel margin around the edges to prevent it from teleporting there). Pause with P and you can reveal the enemy target with R.
This was somewhat inspired by Circle of Death. Each attack comes from a custom block. If you want to go fast enough to survive (without increasing the well-regulated bullet speed), use Turbo Mode! UPDATE: Bombs are better! Post your score in the comments as well as trying to get it to the high score slot. Now, there's a Sierpinski Triangle from Poland in the background. Credit to marcin0o for the Sierpinski triangle. Now, the music is mine as opposed to from Super Mario World.