Tip: You can use Lunar Magic's Overworld Layer 3 Editing system to edit or create your own layer 3 images (castle bricks, fish, rocks) and apply unique effects per level via the Layer 3 Bypass in the main editor.
Death zone is a 10 levels kaizo hack I've made in 2012, but never submitted. Requires savestates and maybe in some parts slowdown.
-Fixed music glitching with newer emulators. For this reason, in some level the music is changed
-Removed some room that crash in newer emulators. Sadly I don't have any way to fix them, a lot of the original files were lost. The hack is still playable fine, only 3 rooms were removed.
EDIT forgot to remove debug mode and add the title screen music, fixed
Well, what can I say? This hack didn't disappoint me in the slightest! Your overall design is a masterpiece, and the music choices were pretty good. There were some huge difficulty spikes, but that's expected for a Kaizo: Hard hack.