I enjoyed it, though tuning wise it seems that it may well be faster to save up for all/most of the next tier before ascending, which was at least unusual back when I was into idlers. Of course, balancing this kinda game usually takes longer than everything else! I for one welcome Earth's scaly new owner.
I was going to comment on the painful noise that played constantly while it is running but after seeing Retinas' comment I wonder whether that was a bug rather than part of the game(possibly a sound mixing issue?)