Okay, impressions:
Mouse support! Doesn't do everything, but you can click anywhere to move there, then click thought bubbles and menu selections to interact with them, and do battles completely with mouse.
Battles:
- Camera and animations at 15FPS, UI (ATB, damage numbers) refreshes much faster at refresh rate or 60fps (i'm not bothering to change my refresh rate around to test this).
- Speeding up or skipping battles deals with my biggest gripe with replaying FFIX
Music:
- True to PSX version. Thankfully avoided the shenanigans that VII and VIII Steam had at launch. Maybe not having a prior PC version is a blessing in disguise, hahaha
Graphics:
- Updated models REALLY pop
- I'm pretty sure the FMVs, or at least some of them, and at least the intro, are higher reso than the PSX encodes. You're welcome to make your own conclusion from screenies below
- Backgrounds are upscaled, still has some tiling issues.

Oh well
Definitely looking forward to sinking time into this again. I dunno if I'll ever have enough time to do the cheevo grind but I need to play this again at some point.
Screenshots: Sorry, was playing in a 1600x900 window, so no 1080p. edit: I don't' know why I wasn't just playing in a 4:3 window, heh. Oh well, at least the shots are useful for people asking how widescreen is handled.
More on the enhanced mobile/Steam UI: Interactions show up this way now
You can tap (or click, w/ mouse) on cards to play cards, etc.