The major update is out now.
The main new fetures:
- introduction scene - new menu system - save and load function - new leveles (in total 7 levels are available now, including the 1st one as a tutorial) - 2 playable characters - weapon development - lot of other stuff.
Development is still ongoing, the actual version is free to download for all the 3 platforms (Android, Windows, HTML5 for browser play)