LucidEngine is a simple layer over MIDP compatible phones that will let you write simple and old fashioned games using a specific language.
Every game you'll develop will basically work on all the devices (even not phones) LucidEngine as been ported.
Falconer-Try Studios is developing this new gaming engine for 2D, 3D and soon VR environments. It will be best for RTS and FPS games. See the documentation for more data.