Esenthel is just developed by one guy, so for a serious game project I'd not use it. Furthermore the installer is written using the engine as well as the tools as far as I could see it. I deleted it after 5 minutes. The only reason for me trying it was that it says it could display unlimited worlds but the example levels look soo empty that notbody could be sure if the engine could stand more details. I'd use the Cryengine instead (at least for an indie/non commercial game).