Dragon Temple

Walk to the far exit shooting any monster that gets in your way.

If you’re finding this tricky, then take things slow.  Walk to a spot with a good view of the path ahead, wait for a monster to get in range, splat it, and walk to the next good spot.  The monsters are quite short so don’t shoot at them while they’re on a lower bit of path to you or your shots will go over their monstrous heads.