Great game, I had a lot of fun with it.
I did 2 runs and It was fun both times, I would probably play other times.
I think it has great potential to be even better, but everything from the art design, to the sounds, to the game loop, I felt like they were really enjoyable.
There are just a few things I would have liked different, like the collectors that sometimes decide that they all wanna get the spheres I'm creating, leaving the mines and making the spheres droped but them despawn. My guess is that probably, by creating many spheres rapidly by clicking the collectors detect more then one sphere so every collector wants to take a sphere from the same place.
Overall for a 30~ minutes game I had a lot of fun, and also almost broke my wrist trying to get a better time on the second run.