That's amazing, excellent job!
I really liked the extra power I felt when I bought the first upgrade to the mining laser. The plasma gun upgrade almost felt too strong, as by the second level I was always killing things before they could get close enough to get a shot in... except when I ran out of power, and then the tension was fantastic, always seemed to take just a hair longer than I was comfortable with to come back =).
Art is just gorgeous, I love the final stage and thank you screen especially.