Just to make some "advertising" fitting the topic:

lemming and I are currently trying to develop an "engine clone" in terms of engine style...

https://github.com/TeamRetro/acknext

I know that we can't compete with Unreal or Unity, but we're trying to achieve a better level of usability than current acknex, but with a really similar workflow (create a script, create some assets, press F5, run your game!)

Maybe we'll get into a state where we can say "hey guys, wanna test?!", but that day is far to come...

Also: If you guys want updates, i can open a new thread here in offtopic...