Have you tried Itch.io? They have a lot of Gameboy and NES roms that are "Name your own price." I don't have any recommendations - I've just started poking around with homebrew roms myself.
I know older titles are usually the topic in this community but a lot of the popular f2p games are getting pretty old now too, and if you're like me you've been curious about some of them and even pleasantly surprised now and again....
Warframe and Lotro are terminal illnesses for me. I'm never done playing them. It's an endless cycle of dressing up a hobbit in Middle Earth or dressing up a Warframe in space.
I don't mind DLC that's done right for games I love. I just know it's a common complaint for Paradox games to have a lot of DLC. That said, there are games that have produced a ton of free updates with very little DLC, like No Man's Sky, Terraria, Minecraft, etc. So, I don't know that it's always necessary to have a ton of DLC to support ongoing game development. It's all very subjective and varies a lot from game to game.
Retro Homebrew ROMS?
I'm on the hunt for ROMS for old systems. NES, SNES, Genesis, etc....
What free2play game are you currently hooked on?
I know older titles are usually the topic in this community but a lot of the popular f2p games are getting pretty old now too, and if you're like me you've been curious about some of them and even pleasantly surprised now and again....
Sims 4 devs assemble team to focus on fixing bugs and upping performance ( www.rockpapershotgun.com )