Hi Sean,
Ive made a simple scene in 4.4 with extra gfx options off using some meshes i made, with placeholder textures, and very simple collision. The game runs much quicker on my Moto G now with no noticeable stuttering.
Assuming the performance holds out as i expand the scene, it should be possible to pickup my project where i left off, else ill wait for 4.5.
.