I'm also using Defold and looking to use Spine (currently playing with the trial), but I see the current version is 3.x (with 4.x on the way) and I'm a bit concerned that I won't be able to export to a Spine 2.x feature set which is the only option currently available to Defold. I noticed there is an official Corona Lua runtime available, but I assume that one isn't compatible with Defold?