The main reason for the bad comments on Kong is the lack of things to do. The energy system is very outside what we are used to seeing... yes most MMOs have an energy system but not one that only allow a maximum of 6 battles a day to start (after unlocking fishing). Kongregate gamers, especially beta testers, are used to spending many hours a day playing their game of choice and with the way this is currently set it is outside the norm.

Also most other games have a huge rush of content in the beginning allowing for the better part of a day playing until they hit the wall where they have to wait to do things again... this get's them hooked and it is not so bad to wait.

Speaking personally, I started the game yesterday, used my stamina, logged in again today, used a vip trial card, was able to get to lvl 13, upgrade everything possible and do all pvp fights in under 1 hour... very hard to keep me coming back day in and day out, let alone spend money when I am getting a very minimal amount of return for it.