I guess you’re looking to spend time with interesting characters.

Endearing party of playable characters:

• Bug Fables — A big tiny adventure of three cute insects, with Paper Mario-inspired turn-based combat
• Cassette Beasts — Creature-collecting with heart. You bring one of several interesting companions with you.
• Moonlight Pulse — A metroidvania set on a planet-sized creature. You play as a team of planet-creature denizens fighting off a parasite infestation.

Encountering interesting NPCs:

• A Short Hike — A very small but dense open world game. You encounter characters on your way to find a cell signal in a remote mountain park. With no quest tracker or minimap, you just wander and do what you want.
• Inscryption — Card game with an immersive, spooky atmosphere. The game is hiding secrets from you, though, and you’ll meet plenty of shady characters before you can get the truth.
• CrossCode — Action RPG set in a fictional VR MMO of the distant future. You wake up as a player character with no memories of real life, unable to log out. You quickly make friends, go do MMO stuff together and get to the bottom of why you’re stuck in-game.

Parasocial weirdness:

• Hypnospace Outlaw — You are a janitor on a Geocities-like service in a simulated 1999 internet. You learn about all the users through their personal websites. This game expresses a large emotional range with just website updates (or the lack of them).

Newgrounds is dead serious about preserving its content, even with the death of Flash. Ruffle, the Flash emulator, was created by a former employee and Newgrounds is a major sponsor of the project. The most important movies have been converted to video as well.

When Newgrounds adopted high-resolution thumbnails about a decade and a half ago, there was a big volunteer campaign to recreate thumbnails for the entire back catalogue of the portal.

Thanks to Ruffle, people can and are still submitting Flash content to the portal, in addition to web-friendly content!

I loved this guy’s previous game, Hyperbolica.