Tip: use the grips for movement and forget about using the thumbsticks that were added as an extra option. The grab-the-world movement lets you control your movement much better, and lets you move up and down too.
The game jam build had a bug that prevented the game from recognizing that all 3 lightning bugs were at the heart. Download the post-jam build to experience the dance party, the blackout, the rekindling, and the fight with the blackout blights.
Thanks for the feedback!