Thank you for playing the game! As of right now, there is no drawback to sharing energy with the spirits, though we considered a mechanic like that early on and are still considering one for the inevitable post-jam version. At least for me personally, one of my goals for this project was to avoid portraying generosity as a losing position, avoid the notion that to be generous you must necessarily lose something. While that's certainly true sometimes, I wanted to emphasize that there are plenty of opportunities to commit acts of generosity which carry no drawbacks at all! In our story, the player character is generous through their efforts, rather than by sharing some wealth of resources. Introducing a drawback for finding spirits could be interesting mechanically if done right, but narratively it teeters on presenting that message that generosity requires sacrifice. Rather than there being a drawback, there's actually a reward of sorts for finding the spirits, but I won't spoil that here.
I'm sorry that you had trouble with the first level, it certainly wasn't my intention to have it serve as a "gotcha"! While I did have an intended solution in mind while designing the level, the order in which you use the blocks actually doesn't matter. In fact, it's possible to complete the level with just one block if you're tricky enough! Did you know that you can pull blocks up ledges?
I don't mind yapping, I'm a yapper myself. Thank you for your feedback and thanks again for checking it out.