To elaborate on James' point about games that have a "GBA-ish look", it's that a lot of GBA games would use brighter pastels that were easier to see without a backlight, with sprites that are either rather low detail and chunky, or consumate to their SNES counterparts, but obviously at a more zoomed-in and intimate scale. I personally just think that's a 'this is an indie game' sort of look. i'd lump celeste in that category too.
I'm more just happy that Chucklefish is showing that that Stardew Valley publishing money is being put into their internal projects to make them not as decidedly stiff looking as Starbound was. as much as I love the dickens out of Starbound's setting and find it's gameplay to be a far more zen-like experience than say... terraria, it feels like Wargroove on the whole is a far more focused game than that.
... which is to say, it is focused on outside of a few small liberties, filling this niche that feels comparable to Black Hole Rising but with a more fully featured editor (since the editor is the same tool they used to make the story mode), rather than how crazy fully featured Dual Strike on DS was. it effectively has a near identical roster of unit types if we take Md.Tank out and have a water based infantry unit. the real big diffrerence is that units are even more disposable in Wargroove considering the fact that you can't passively repair your units by just sitting them on a property, but rather have to pay to heal them. you also can't combine platoons as a cost-cutting measure to repairs. it's got juuuuuuuuuust enough there to not be the exact same game, but it's sooooo close. I also agree that Regna is a pretty annoying character by design. then again, considering the nature of what Regna is, it kinda makes sense?
Also, fun little fact for those of you who may actually read this post; The Floran are actually something lifted straight from Chucklefish's other first-party offering, the aforementioned Starbound. Nuru is even a character you encounter in that game as a space-faring hunter who decides she wants to help your character save the universe. I Guess after all that happened, she decided to take it easy and do some old-fashioned primitive hunting on an under-developed world!
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I started Octopath Traveler with Primrose and feel like I was immensely rewarded by both having the most compelling of the 8's story front and center to grab me, and having the best party member in my party at all times to get EXP and money when those resources were in high demand.
I also had a merchant around quite a bit to toss BP around a lot and really got into the extra classes who can give you a head start on having boosted attacks, and that speeds things along quite a bit for the mid to late game if you're the sort who's skilled enough to beat those optional super bosses. Said Super Bosses are where the likes of poison damage, because it's percentile, can often outpace the turn-to-turn damage your party is doing, especially if your focus is keeping the boss pinned down as much as possible. Leg Trap is invaluable in this regard as well.