No, this is not just the demo.
Altough Godot TPS demo has pretty cool graphics iself, but it is just only a graphical demo of the engine. So there is no backgound story, no player stats and no level finishing goal in the demo.
In the current version of Alien Contact game (v0.1) there is already a backgound story with a nice intro video created by me (you can see the original video here:
this is a sci-fi fan made video, this was the basis of the game intro video).Also the player has stats: health plus ammo (also I have created the hud bars for visual of the stats based on godot engine programming tutorials on youtube, there are plenty of tutorials out there) and the programming part: when player dies it will end level and back to tilte screen. Also I have programmed the part when the enemy robots explodes then the player gains more health and ammo.
And finally the level can be now completed when all of the enemy robots are eliminated (this is also not there in the original demo).
So the work has just been started, there are lot of things to be done (e.g. more levels, more types of enemies) and I am also planning a nice customization of your player robot at the beginning of the game (visual and in attributes too like weapon damage amount and ammo related parts). I am working on new levels and new items too.
I would like to have some kind of crafting system too, but it needs more time to fit into the level design and also the implementation.