The Pathless is pretty awesome

Sky: Children of the Light is splendid

Horn is pretty neat but I guess its 12 years old now

Baba is You isn't originally a mobile game but it has a native version which is pretty excellent

To answer your question, its as others have mentioned: catching a whale is more lucrative than appealing to the average consumer. The entire micro transactions industry (which mobile gaming is built upon and makes it the most profitable portion of the gaming industry by a mile) is all about milking your customers for everything they have without them realising it. Why did we reach this point? Unregulated capitalism, probably.