Only checked this out now, looking very cool. And yes, Haxe is awesome because you can target a variety of platforms with more or less the same code. For mobile versions you might need to change a couple of things, for example orientation and touching instead of clicking (although it's good to use utility classes and/or conditional compilation for this), but apart from that it's still the same code.
By the way Lexou, for tests are you compiling to C++ or Neko? I'd recommend the latter as that is much, much quicker with pretty much the same result. C++ should only really be used if you want to use specific libraries that are exclusive to it.
By the way Lexou, for tests are you compiling to C++ or Neko? I'd recommend the latter as that is much, much quicker with pretty much the same result. C++ should only really be used if you want to use specific libraries that are exclusive to it.