What a fun demo! Blasting the asteroids was really satisfying, especially by the end. And you managed to keep a relaxing vibe even with a timer, so congrats!
Played this for an hour or so and I got frustrated with my inability to progress D: I got to the point where I had all five rounders, but even if I shoved them all into skills I couldn't finish the Propulse task. Building them back up took too long and I got bored, sorry.
This was a lovely way to spend my afternoon! I crave the mines, and this had a lovely combination of low-risk environments and satisfying diggy noises. I can't believe you made this in three days! No bugs in sight.