1) I started releasing it as closed source because I don't have knowledge about open source management. I work in the corporate world for many years and I know how to manage private projects. At this moment I fear that if I release it as open source, it will fall in a kind of anarchy and that I will lose control over it. I know this idea is wrong, there are many well driven open source projects that generate revenue, but until I know how does this world work, I prefer to share it as closed.

I hope this aspect is not so bad that people don't want to at least try it to check if it's worth it...

2) The MSVC-only build is for the moment. In my roadmap I've planned builds for at least Linux, Android (NDK native) and Windows Phone. But the platform I know more is MSVC, so it's the first release. In fact I have a working build for GCC that will be the starting point for Linux and Android, but I still have to integrate libpng. This build only loads BMPs (not PNGs) and CSV tilemaps (not zip compressed) as the MSVC build does

I totally agree, that's the worst part of the project.