I've been on Avabur (https://goo.gl/cuQdUy) since May 28th of 2016. I have grown to fall in love with this game, as it has a wide range of features and fun stuff to do, while consuming very minimal amounts of time. It continues playing as long as I have it open in a tab, even while I am asleep or surfing other parts of the web. The game has around 1000 active players. Some of the features in the game are as follows.

Battling, fight monsters, level up, unlock better gear, and fight bigger monsters.
Tradeskilling, harvest resources, make profit, invest into boosts to make even more profit.
Crafting/Carving, you can make equipment and gems for yourself, or other players.
Housing, build items in your house to unlock boosts, you use resources from Tradeskills to upgrade house items.
Clans, join a clan, reap the benefits, and grow stronger with your clan mates.
Market, trade your currencies, resources, and items within the market to other real players.
Boosts, well.. they're boosts!
Much, much more!

The game is 100% free to play (with the option of purchasing if you wish), it takes seconds to register and start battling or harvesting resources. Imagine World of Warcraft, or a large MMO, crammed into a website without graphics, however still with plenty of fun things to do, even chatting with others!

Go ahead, take a handful of minutes, register, and peep around and see if the game is for you. I have a feeling you will enjoy it a lot.