Has anyone done this before? A turn-based shoot-'em-up? We really can't think of one.
Before we find out either way, let's marvel at R-Type Tactics for what it is: a semi-remake of the R-Type saga where each side politely waits for the other one to have a go. And instead of one solitary ship blasting through the Bydo Empire, you have an armada.
As regular shmup tradition dictates, you start on the left and make your way to the right, encountering and attacking enemies through the fog of war en route to the main objective, usually the opposing flagship. In fact, one of the first few missions is a fight against Dobkeratops, the infamous first-level R-Type guardian with the large tail and the weak-point in his belly. Except this time with less bullet-dodging and more hit-point management.