Why that high GB 1.7 ?

Why is the capacity with 1.7 GB so high?
If you have a divice with 16 GB it is hard to play.
Other games I am playing have had 3.0 GB and changed by update to 690 MB.
May be you are able to to the same thing, that much easyer to handle.
Thank you

Lotteliese about Tap Paradise Cove: Explore Pirate Bays and Treasure Islands, v7.9.3