Not sure is this is quite what you are looking for but Nicovideo Game Atsumaru service has bunch of games of very varied quality you can play (for now, apparently the game service will be shut down on June 28th).
https://game.nicovideo.jp/atsumaru/users/64341294https://game.nicovideo.jp/atsumaru/search/tag/%E3%81%AB%E3%81%98%E3%81%95%E3%82%93%E3%81%98https://game.nicovideo.jp/atsumaru/search/tag/%E3%83%9B%E3%83%AD%E3%83%A9%E3%82%A4%E3%83%96You may find more stuff if you look around, stuff isn't always tagged the best way.
