Update on Sunday 7PM AEST
The developer of the software has responded, stating that users were incorrectly gifted the wrong version of the software which resulted in it being distributed as a Trial rather than a fully licensed version of the software.
https://steamcommunity.com/id/Enternode/recommended/325180/#…
Hi, yes it would seem that the wrong build is being distributed by Steam. Sorry about this mistake, we will get it rectified with Valve on Monday when they are back working and everyone who selects the free version while it's on offer WILL get the full version, you have my word. Again, very sorry for this delivery mishap it was never our intention to mislead anyone.
EDIT: People are reporting that this is apparently the demo version. A little shifty by the devs because the store page clearly says it's free to keep until the 20th and shows that it was $139.95.
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Is this just tutorial or game engine?