Is the goal of Buddhism freedom?

Yes. Gain freedom from all of sufferings (Vimukthi Sukha).

There are two types of happiness (Sukha). Sensual Happiness(Kama Suka) and Happiness gain by becoming free from sufferings (Vimukthi Sukha or Happiness of freedom).

Ultimate happiness of freedom is Nirvana (or permanent enlightenment). Buddhism describe that this happiness of freedom(Nirvana) is very much valuable than Sensual Happiness. Sensual pleasures are very short and receive from the outside and has lot of disturbance. For a small sensual pleasures ( such as for a good taste of a food), we have to do lot of efforts. Also, to revive a sensual pleasures, we may have to do bad things(Bad Karma) this will arise lot of bad sufferings in the future (according to Karmic lows). Sensual happiness is like a dog try to eat a bone. When a dog bite a bone dog's own blood came and it taste those. Nirvana is permanent. Even for trillions of trillion years it is permanent. If you stayed in worlds for a long time you may have to cry for numerous times such that, if all tears collected it will be more than the amount of water in the sea. But you will face only negligible amount of happiness. Nirvana have no disturbance. Nirvana is not something compounded or exist since a cause. Nirvana receive by removing all causes. That is why Lord Buddha said below as his final words;

"Behold, O monks, this is my last advice to you. All compounded things (which is born, come into being) are subject to decay (So, caused to sufferings). Work hard to gain your own salvation without any delay."

Buddhism says Nirvana (ultimate freedom) has infinite good qualities.