It's a cute idle game, but it's incredibly opaque and poorly paced. A game that slices into 6-12 hour increments is a bit needy for idle, but has too little to do for active play, assuming you understand how and when things are bought by adventurers and whether decorations or new buildings are preferable without any persistent stats or positions showing.

The promos very poorly explain the game.

Core loop:
Set the sky.
Use all your money to pay adventurers for quests and buy stuff off them.
Use that stuff to build a town, but it's all for looks, even the boss drops build stuff with either the same or no stats.
Place buildings near decorations to increase building speed and levels.
Use the rest of the stuff to stock shops to make money on adventurers.
Wait 6-12 Hours just before the sky disappears and adventurers leave.
Repeat.

Personally, I find the music to be bland compared to other chill chiptunes. Take Gestation or Pulse from Cave Story for example. Or Mega Man 3's Ending Theme, Dragon Warrior/Quest IV's Town theme, Final Fantasy's Town Theme, Terranigma's Call at Port, Chrono Trigger's Memories of Green, etc.