Definitely not a pay to win game
So the game has optional Iap, but the game does not force you to pay money to win. You do need to however grind some levels to get stronger so that you can invest in skills if you want a 3 star rating on each level.. And even without a 3 star rating you can still get all the skills you want in the game. Give it a try and support good games like this!
Yogipai about
Cursed Treasure 2: Evil TD