'Small' update from me, I think I have all the gameplay elements working now. There are still many graphical issues that need to be sorted out and other minor things like jiggle bones and player shadows to be fixed but now that the NPC dialog, object interaction, and scene transitions work you *could* play and complete the game as it is now. But another thing that I want to do before wrapping it up is to re-add what Mike Inel removed to comply with Patreon, the textures will be easy to swap and giving Fionna back her chest jiggle and idle anim should also be do-able. The problem occurs with adding Fionna's Shibakini mesh, having to re-rig it to her bones and add another clothes item to the code that handles swapping the meshes without breaking anything.
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But anyway, here's a video that shows dialog and transitions working, you'll notice a lot of objects are really pale, that is because the textures themselves actually have no color and is instead colored by the shader on a per object basis, the values used to determine this was lost in the decompilation process and is probably something I need to find by inspecting the packed game.