Destroyable environment like Company of Heroes but modern rts setting.

Cities Skylines in the latest Unreal Engine.

Stardew Valley in pretty 3D graphics with no tile system. Valheim comes close but the graphics, while unique, is far from highly detailed.

Teardown multiplayer shooter.

General a lot of single player could use a simple coop that's just playing the game together. It's very rare that coop is more of an addition than a game focus. While often I just wish I could share the fun with friends together. It's sadly because of the complexity of adding coop, vs rewards when it's "just" the same experience but with friends, instead of a competitive like mode where they can sell skins and shit.

I personally always wanted to build a battle ship simulator game with crew system and destructible ships, with harsh survival elements like in the movie Master and Commander. Where you're very close in the action and ships get real impact holes. Most indie games don't come close enough on the realism level I'd like to see. Sea of thieves is somewhat there.