Well, fiddling with the game files, there's some stuff being not used / implemented, for example a cat chase minigame, and a some sort of RPG-esque attack / defend / wait sort of minigame
And for some reason the Crystal extra scene on the Achievements section has been removed from the code, playing normally will garner you 80 of 81 Achievements, because the achievement that you get for clicking certain tile on the Achievements section is still broken on the code
Furthermore, there are a few sprite placeholders for upcoming stuff, for example one for something related to an extra image / scene of Janeth, some placeholders for Iyv, and some placeholders for the before-mentioned RPG-styled minigame
And there's the extra codes that I have found, but there are no way to input / use them in the game so far