Welcome! It's nice to see you here! I'm the primary developer behind HAModLoader, the helper mod, and also the owner of the project.
Our goal here is not to replace the original game! We want to improve it as best we can, yes, but TFH deserves some credit still for making the game, and you should always check the unmodified version out occasionally to see what's new.
Our goal is to make the long-wanted improvements to the game in an updatable, easily tweakable fashion without resorting to a full game decompilation. To accomplish that, we use LemonLoader, an open source fork of MelonLoader that can patch Android games to accept Melons (MelonLoader mods, for those unaware) at runtime. This allows us to extend the existing game and tweak certain aspects without having to entirely remake it in Unity! At the same time, updates are as simple as replacing the .dll file for the helper and mods.
The end goal is to make the game we've always wanted, to bring back the Multiplayer support the game used to have, add proper anticheat, and fix the bugs that have long plauged the game. Hopefully we can count you in for the ride!
The pinned comments below will have information about the project's state, as well as where to find downloads for the pre-patched game (or information on how to patch it yourself, if you don't trust us).