Just finished to read manuals to understand main concepts of engine. Everything seems clear (at least theoretically), except of logic of collections, proxies, etc. Maybe, I need to spend little more time with that stuff :) Also, need a little bit more practice with Lua, never used it before.
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=] also there's a list of nice video tutorials by our community: https://www.youtube.com/playlist?list=PLS9MbmO_ssyC5gN_850U7iz21ZhdjS3J8