0_o favorite piece in the entire jam? Awesome! I'm so happy you enjoyed it!!
I have heard and listened to the Land of the Lustrous OST, It does seem to use a similar mode to Pelog Selisir in the opening.
I was mostly inspired by Indonesian music and Video Game Music though, if you enjoyed my piece you may enjoy the music from the game "A Space for the Unbound". The song "Within the Dream" uses the same scale/mode.