R.A.L.S.E.I. stands for Robotic A-75 Lock-on Searcher Exordus Infinite. A-75 is a form of energy crystal that has been liquefied into a gloopy, radioactive substance. Exordus Infinite is the robot's codename. Searcher implies "Search and destroy". So the R.A.L.S.E.I. is a robot powered by radioactive gloop designed to lock on targets, and find and eradicate said targets, whose codename is Exodus Infinite. (if it doesn't work click "see inside" and then click "reload" then go in full screen inside and play!)
credit to for reality check through the skull!