Very Awesome game. its a good alt if you cant afford bt6 But overall this game is Very Very Very time consuming. You need exp to unlock upgrades for towers. depending on the tower the exp can be high or low. the problem is that getting exp is really hard and the only multiplier thats free is from battle chests which either dont help much or are hard to get. You can buy the vip but u might as well buy btd6 because its more fun and while it isnt cheaper its only tempoary(the vip pass) while btd6 is permanent and easier to get exp. another problem is the ads. while they time consuming they are annoying my suggestion is to prob remove or make the ads less common. Overall a game that has its problems but still quite fun