Fun with good music. But spawning only 3 units at a time makes it very tiring and the difficulty is not balanced because it just depends entirely on if you won enough battles early on so either you steamroll the enemies or you get steamrolled.
For the first level you really should spend your first two points on Quick Learner and Businessman, effectively doubling your money and xp gain at that point.
Yes, Stacey, stay "safe" by going out camping THEN have everyone leave you ALONE in a tent in a wilderness filled with wild animals so murderous that they kill aliens with ease