It's decent but as far as I recall, it only works for mobile yeah? I guess desktop support is coming soon. I haven't used it in 4-5 years but I released my first commercial game with it.
I liked how the whole system was set up with the exception of its lack of Z-sorting, which prompted me to go create my own 2D engine, which borrowed heavily from how things were set up here.
Other than that, it's really simple, easy to get into, and it's been free for awhile (used to be like 300 something per year). If anyone was making a 2D game and wanted to program using LUA, it's pretty much all you'd need.
Would totally use it for 2D games if they implement the Z-indexing and desktop support. Here's some stuff I worked on years ago.