Its not bad but there are so many games similar to it. I like the upgrades you can by though. Only downside is the lion cages often overlap other items and when you warehouse is full you loose items because you are waiting for the cage to go away.
It seams there is quite a few times where they will come out of their room for just a second then go back in before you have a chance to get them. Then when they come out they are ready to leave.
It took me 35 days but great. That 3% wind resistance is the magic number you dont gain much height but I guess you really do not need it. I was at about 60ft my trip.