Yes there is the 3rd character that is not yet introduced in the demo. But we are pretty sure it will be revealed in next update and also he will take an very important role in this game.
We ran a couple tests for Android version but the presentation became so terrible. And the optimization might require many resources, which is what we are lacking atm.
So we have to focus on the Windos/Mac version currently.
The current plan is not to release too many build updates before releasing the final version. We believe chopping the whole story into pieces is really not a great idea for this game.
Anyway, we will do our best to finish this project asap.
We are not familiar with Linux system, but we just added the marks in the file and also added the description for launching it on Linux. Kindly advise if we write it wrong.
We haven't plan to have an android version at the moment due to lack of resources. We'll see if there is chance to have one in later development stage.