This game goes places. Like, I have compared this story to Gurren Lagann in the sheer scale it works with. You start out as a mechanic on a backwater world, barely able to make ends meet, but without a family to support, you save your money, and then get away into the wider galaxy, then several other galaxies too. Along the way you meet a collection of oddballs, fight in wars, save your sister, and do all kinds of things with escalating conflicts, leading up to you fighting the end of the universe.
And none of it feels like it rocketed up the scale. Every step is logical. you don't go from mechanic to world savior over night. First you're fighting a single fleet warlord, then pirates, then a small corrupt police force, then a large force of pirates that's basically a small nation. On and on, with you going up every time to the point where it seems like you should hit the top, only to go farther.
As for the gameplay, the main mode is a One-Dimensional battle in space. Not 2D, but 1D, as you can only move left and right. But with weapons that work on cooldowns, and at various ranges, fleet compositions, and all kinds of other factors, that seemingly simple gameplay goes hard.
In addition you have things that feed into it. From an equipment system that plays like tetris, fitting as many accessories as you can into a grid system, to a melee fighting system with a rock paper scissors mechanic. To the visual novel presented story that has MANY branching decisions that affect not only what equipment you can buy, but which characters you can recruit, this whole game is a lot, and it works wonders with it.
A fine example of what a game studio can make when its dedicated, and a plot that, while seemingly having a hole or two, is actually going places with those seeming errors. All in all, a fantastic time.