It feels like a good setup and a nice start, but probably needs more push towards a final conclusion.
If the black hole were expanding over time then it would feel more like a high-score challenge to try and get as much of the 'E' resource as possible before being inevitably eaten or if the 'E' resource allowed you to scale in some way or open an actual escape from the area then it would be a race to finish your job before running out of time. If that's possible then I totally missed it and that's on me. Right now it's fun to just go around collecting the stuff, but you lose a sense of purpose after a while and I honestly had to hunt down the singularity my second time through after finding it by accident my first time, lol.