My overall experience with it has been good. What I appreciate about it most is that you can get started quickly, and use JavaScript. I believe it could be scaled to larger projects, if you take the additional step of bringing in a 2D game library. With just the core functionality, you need to handle physics and collisions yourself, and as far as I can tell, you can't do things like rotate sprites by default (although you can flip them). So I think there is a lot of potential, but you need to do a little more work yourself to extend what is available, rather than having it already be there for you.