Fun game. It is relaxing, entertaining, fun and simple.
I actually had lots of time playing this; there's plenty of upgrades, so the game doesn't fall short way too soon (actually you'll must likely win the game without fully upgrading). I really like it, my only complain is that you don't get any money for arriving to the moon; I remark this because I gave the game a second play and ti kinda annoyed me, overall this is great.
PRO TIP: If you stop your engine when you're about to crash, the rocket won't flip so much.