Sky: Children of the Light

You can give your friends small gifts every day at no cost to yourself, but you can give them an upgraded version of that gift as well.

100% completion of a realm gives you access to an 'ultimate gift'

The game allows you to buy the game's normal currency, but not what seems to be considered the 'premium' currency. At certain times the game also offers cosmetics for real money.

You can only gain cosmetics from seasons while the season is ongoing. After it ends, you have to wait potentially months to years to see an npc who has items you want again. The npc is chosen "randomly" and then you're given 3 days to get their cosmetics and emotes through various igc.

There is only one way to achieve a certain igc and it's pushed as an emotional journey too experience through music, text, story implications. You can only get this igc once a week. The game also wants to be a wholesome, emotional game in general and strongly pushes the social aspect. It gives you the option to purchase in game items, currency, and seasons for other players.

Seasonal rewards that never come back. You can only get these by 100% a season, which is behind a paywall.

Kind of. It has an end but is like a looping story, a kind of neverending cycle.

The aforementioned igc every other hour events. There are also seasons which occur for about 6 weeks. You can only gain igc for the season during the season and you can only get cosmetics and higher level emotes during the season. Some igc and cosmetics can be locked behind wait times during the seasons.

It's not monthly or mandatory, but seasons typically occur 6 weeks on, 6 weeks off. There is an option to pay for the season to get access to cosmetics and emotes locked behind the paywall. It also allows you to gain a little bit more of the seasonal igc.

Game strongly pushes cosmetics, purchased with igc and iap, there are two events every other hour that provide easy access to igc. High temptation to play just for the events when you don't have time to grind for igc.