i think why the mod was cancelled was either one of these reasons:
1) Horror Mode would of been too hard to make (or just... yeah, whatever)
2) Too much anims to make, and this was meant to be a complete mod.
3) They didn't have any ideas for horror mode.
4) The file could of been too big if this was finished.
5) Mr. sun could of been too hard to make in horror mode (WELL DUH LEAVE HIM WITHOUT HORROR IDLE OLD ME)
6) bugs.
7) They didn't just have motivation to finish this.
Whatever, yaaa