Just around a day ago, a port of Tomb Raider for the GBA powered through OpenLara (an open source Tomb Raider engine implementation) was released in an alpha state. The developer goes by XProger and was able to get a semi consistent ~15 FPS by using a lot of optimisations and hand written assembly code. For now, only the first 3 levels are playable, but XProger aims to support more levels and improve on this port.
The source repository for OpenLara and its GBA port is available here and its thread on GBAtemp is also here.