The resolution upgrades are great, and so are the little new CGs for a few old scenes.
Though, I really want to know why doesn't the game have any SFX to this date. I haven't been following any development since 0.18, so has this been addressed already?
To add insult to injury, 0.21 has even removed the little amount of songs the game always had, such as the menu and the map songs. Why? Do they have any plans to add more later?
I won't really comment on the releasing schedule, everything's been said already. But not having any sounds at all always held STS back imo, and still does.