ngl it's very bad mod for legend of mushroom
there is way more to do and that way of patching the index file is bad in mod menu
maybe just load the patched index.js directly inside mod menu after the game downloaded files
and for the features you can add:
- one hit
- no ads
- lamp speed
- global speed multiplier
and many more..
it's popular game
making a bad mod is just very bad release here..