Fun game, nice progression. There are IAP which provide boosts, but if you're okay with a bit of a grind it is quite enjoyable. Similar to many other prestige type games you unlock automations pretty quickly, so you can begin to idle which is a plus from me.

The dev is making updates (and listening to player feedback, so far on reddit & store reviews) which excites me about the future of the game as well.

Give it a try, scratch a few scratchers.