Too easy imo. Got Moon + Mars on my 3rd trip. Did some free play and scored $297,000,000 on my 4th launch (Hedgehog wouldn't come down after I ran out of fuel, left it while I went to work and he ran for 1h 15m lol)
If you go to the PVP Option and then get tired of waiting and go back to Main Menu, you lose the 15 coins still even though you never got a pairing. Not very happy about losing coins that way before noticing it...
I liked it, AI needs to be better though imo, they just follow the same path over and over again and makes it too easy, Air units seemed underpowered, never used them beyond first couple levels and enemy air dies quick.