snoopy123123 Hello there! I am also a .Net developer and currently using C2 for HTML5 games. The export options are part of the paid version and even then you will have to rely on third party wrappers and compiling services usually. This is due to the fact that the export is pure html5. Not a native app. So there has to be some type of wrapper to allow for compatibility on the various devices.
So far I am loving C2. Outside of that, besides looking at platforms like Gamesalad, Stencyl, Gamemaker Studio, etc... if you want something that allows you to use your native .net skills you should look at Unity as it is free for most of the functionality and exports to all the platforms as well. Also similar and newly opensourced is the Godot engine. However, neither of these allows the simple intuitive workflow that C2 allows for. SO it really depends on what you want to do. If you choose to stick with HTML5 you will also need to be comfortable with living within the limitations that come from using it as a gaming platform.
Welcome to the community!