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Features
The full feature list can be found in the project's repository here. The list in that link is easier to read as well.
A Key System has been implemented similar to Black 2 and White 2. Accessed from the main menu, this contains several difficulty options as well as the version toggle.
2-in-1. This hack includes both FireRed and LeafGreen in their entirety, played with one savefile. This allows to player to organically catch the version exclusives in one playthrough. The current version can be toggled from the Key System.
Easy and Challenge Mode toggles; a built-in Nuzlocke ruleset; IV and EV calculation modifiers; a "No Free Heals" mode that prevents healing by any means except items; and an Experience Modifier are all accessed from the Key System.
The built-in Nuzlocke implementation is a special version of the standard ruleset to allow for a semi-normal playthrough. Fainted Pokémon cannot be revived by any means (including with the PC), and the player can catch Pokémon other than their first encounter in an area, those Pokémon will just be automatically fainted so they are unusable. This allows a Nuzlocke player to still fill up their Pokédex normally.
With No Free Heals toggled on, the PC will not heal Pokémon deposited into it in addition to disabling heals from the Pokémon Center and other healing spots.
Press L in the Key System menu to access the help entries that explain each option more thoroughly.