The main idea for RogueViz collection was to make the games available to people who prefer to play games on Steam -- the games are available on itch.io as individual games. (While idealistically itch.io is better, I generally prefer people to buy my games on Steam than on Itch since I believe it makes them more visible, especially with a review.)
Although their versions in the RogueViz Collection are improved -- more specifically:
- they have online leaderboards and achievements (these are only possible on Steam)
- it is a single executable in which you pick the specific game from the main menu which might be more convenient
- some new levels in Nil Rider (which have not yet been added to the itch.io version)
- NilRider/Bringris have a "star" system which unlocks more complex levels after finishing the basic ones
- the online version Seuphorica is only square grid while the RVC one allows non-Euclidean, and also they have different interfaces
- some bugfixes and other minor improvements
- probably more in the future
So I was not planning to make an itch.io version, but I guess I could make one.