This is the most important question to address. The official mobile version of Hello Neighbor is a port of the full game, which does not include the level editor or modding tools.
Modifying a game you purchased is generally considered legal for personal use under "fair use" in many jurisdictions. However, distributing the full Hello Neighbor APK (piracy) is illegal. The Mod Kit is a modification; it requires the original game assets to function. If you own Hello Neighbor on Android legally, using a mod kit is a gray area but rarely prosecuted. hello neighbor mod kit android download