It sounds like they'll improve upon this base into the next remake however which seems like it's inevitable since this will probably sell well enough (and more than Adventures of Mana) for them to begin work on Seiken 3.
I wouldn't put too much faith in that hope, unfortunately. This is actually the
third Mana in this style, we tend to forget the free-to-play Rise of Mana from 2014 (JPN only.)
There's advancement between them, but maybe not enough to say Square responded to a groundswell of interest? It is what it is despite that they all seemed to do okay and that Adventure's success, coupled with immediate orders on the Mana Collection, should have been more than enough "research" to know how much to spend of Secret of Mana.
Things have for sure gotten better, though. I would have wanted more love and horsepower poured into SoM (it's not my favorite franchise necessarily, but it's one of the games I always wish Square had remade all these years, mostly because the lost CD content and the mangled/cart-strangled localization scream for a "definitive version" of Secret of Mana, and also online multiplayer in SoM seemed like a no-brainer for a nice downloadable game when that business was hot,) but the engine and budget has evolved that this is enough to sell me despite my reservations, and if it plays well then that'll go a long way.
The only other Mana redesign I'm aware of is the Spelunker Z / Seiken Densetsu 2 DLC, and that wouldn't have gone over either...
https://www.youtube.com/watch?v=oHwODoT4BF4
I don't blame the developer for having little to work with. I blame Square Enix for being so tight with their coin purse for anything that's not FF or KH. They're being pretty spotty with the SaGa revivals too.
Right, neither Revenant SaGa and SaGa: Scarlet Grace are lookers. We can also include Tokyo RPG Factory's works in there if we want to. Not sure why Square is so stingy, I can understand not putting money into SaGa (it's a troubled franchise, better they let inspiration come where it can on that one,) but Mana is a brand that has endured and could be built upon (Square likes to reinvent all the time, but a back-to-basics Mana game would be something it hasn't done in ages; just do some things people flat-out like and then you can do crazy ideas and twist up franchises afterwards) and just in general it'd be better to have other properties hopping. I'm not expecting them to break the bank on every product they produce, but Square Enix is letting a negative reputation build.