The closest analogy would be the Flash IDE. Art (3D, 2D, images) is made outside. So is any coding. It integrates nicely with visual studio and Blender (and Maya and Photoshop and the like) so the process is fairly seamless. For example, debugging works.

Yet it produces native apps as well as WebGL.

An infinity of tutorials exist in as many qualities so learning resources of every level are hyper abundant from gradual to accelerated. A passable 2D app is probably possible in a few days starting from zero knowledge. But a impressive 3D game will take mastery of quite a range of its abilities and probably require a team.

Since it is not dependent on a proprietary player, it probably has more staying power than Macromedia/Flash but it does have competition from Unreal which I imagine is a viable alternative.