Thanks for the kind words! And yeah, the fine-tuning and balancing definitely needs some work. Based on a lot of the feedback, it's probably worth either slowing down the initial decay or speeding up the text (or both) for people that want to take their time on that aspect. Maybe a 'difficulty' toggle?
The origin of the 'energy' system was to become a baseline that I could theoretically layer more things on top of ('locked' doors that cost energy to open, etc). If I were to add complexity, it'd definitely be fun to work on some limited "abilities" (draw a line of stable 'ground' out in front of you to cross gaps?) that cost energy to use. Upgrades is definitely something I considered.