Majora's Mask: Recompiled Difficulty Overhaul

Features

Makes most enemies in the game more difficult based on the current selected difficulty.

As of now you can pick between Normal and Hard.

Summary of changes:

More health & defense based on the enemy
Tweaked the behavior of enemies & bosses
Additional enemy spawns (limited)
And various other small tweaks/fixes to enemies.

Disclaimer

This is NOT just a "hyper enemies" mod, as it makes more substantial changes.

This modifies most of the enemies' actual behavior in the game to be more difficult instead of applying a flat 2x speed increase. (not that there's anything wrong with doing that)