It's rather abstract... so if I understand right, you let the world evolve while the player is playing it? Not like the usual world generator where the world is generated once at the start, but after that it's only the player changing the world.
It might be interesting to see the ecosystem behave in a reaction to what the player does. Perhaps the player is not seeing the tier 1 resource you call "energy", but his actions could alter it?
Also, do you have a goal or story in mind? There is an ecosystem, but that alone doesn't sound like a "game".
The world rolls on and does what it does - yes, this isnt a game, this is the infrastructure for a game, that does what it does as the player, or players, does whateve (including possibly spawning fancy graphics, or maybe tier 4 is mobs, or whatever).
Note that as a player grabs craftables etc, then they arent there for transformers to transform into other things - so while Our Heroes cant alter tier 1 energy, under this design they can alter tier 2 and so on.