I'm rather impressed. This is a simple game of deck building of dice. Your cards affect your dice. Your characters do have skills. I have not seen a single ad. The game is addicting. But what is more, I've played for 3-4 days and have unlocked all the characters and bases. Not their levels and skins, but being a free player... all that is pretty amazing. I do not think this is pay-to-win at all. I'd suggest saving most of your gold to keep upgrading your favorite character for skills.