A simple cheat works for latest version of Katana ZERO game, with 4 functions, typein corresponding number again to disable function.
- Unlimittime - which gives you unlimittime in levels
- Enemy can't hit you - You could still be killed by lasers.
- No clip - Disable collisons to walls, You might fall into void with this.
- Disable Enemy AI - As it says it disables all enemies' AI.
Basic hack logic from GreenHouse's Table
GHN's code for searching memory helps a lot too.