IIRC fairy heart is built on game maker 8; you can download game maker 8 for free and then you have to replace the animations with your modded ones and export an exe file.anyone found out how to mod the game?
I found a way to extract the HCG files and edit them a lil bit but I don't know how to apply to the actual game:/
It's also possible you just need to change the hcg files with your own hcg files and name them the same; again you still need GM8 to export them in the right format.