More balance to either money gain or lower upgrade points, you get to a point where you have to grind to much for a little gain as you cannot break any records for a while and hoping that stars appear in a good place. Also having a bird right over you head when you launch and having to wait for it to move makes the game slow down.
Very short game, repeated enemy tactics of simple attack from the back. also upgrades appear broke once cavalry was upgraded nothing would kill them and could solo maps