The standard price is $19.99 , though it frequently goes on sale for significantly less (sometimes as low as $1.06 on authorized marketplaces).
A one-time in-app purchase of $4.99 unlocks the full narrative. Coromon-Game-Free-Download
If you have an active Google Play Pass subscription, the full game and its in-app purchases are included for "free" as part of your membership. The standard price is $19