Multiple Lighting and DrawCalls Playable Alpha to Help Understand Problem

I am looking for some advise on having multiple spotlights and other light sources while reducing the draw calls / CPU usage. When creating for a web/pc deployment its not much of an issue as Occlusion Culling takes care of a lot of it. But we plan on releasing it on iPhone/Android and so on.

This was a Game Jam game that I am looking to develop further but without the look and feel of the game then it loses a lot of its charm.

So I am looking for suggestions on how to get the same look and feel but without the insane overheads to produce the effects.

YouTube Vid here http://www.youtube.com/watch?v=S_uTkWmieDo

Playable Version here. Arrows left and right, and Q & E to 90 degree turn. http://www.mabitgames.com/HellsHospital.html

Thanks in advance.