Too Slow for Target Age Demographic

This games is ridiculously slow to build up without having to immediately purchase coins (or other tokens for expenditure). My three year old has been playing it for 2 hours and he has 2 gorillas which he purchased immediately with the coins provided, a crocodile, and a TINY piece of land surrounded by an ocean on which to put them. He has managed to expand and maybe by the end of the day, if it is the only thing he does (reminder: he is three) he may get another animal. The speed at which to earn rewards is too slow. Its mind numbingly dull.

eno1one about Tap Zoo, v5.2.1