Cute little art collab! Wonderful to see so much entries within this: couldn't believe the way it just kept going and going! Very well done on wrangling all of this together and getting some positivity out there.
Now I give you the loveliest gift I can think of, which is brutally honest feedback (the love nobody asks for, haha):
*The general interface is a bit of an eyesore where everything kind of blends together in bright colors, making certain features like the Previous/Next buttons difficult to read and not pop to the foreground as much as they should. Mayhaps a little bit of desaturation of the background, outlining of text, and other simple elements would help readability.
*I was a bit bummed that the collab chose a very basic slideshow presentation instead of opting for something really creative. I got a bit interested with the heart and candy box on the side as I thought that maybe they had some sort of interesting powers, like the heart being some sort of voting system or maybe sending a message to the artist, and the candy box being some sort of button to go to a random valentine or get commentary from the artist, but it seems like they're just kind of there for no important purpose. I think a more creative presentation would help viewer retention, as without some sort of interesting gimmick, I wouldn't blame a lot of people for getting bored halfway!
*There is some missing functionality that I feel should be present, such as a gallery view, zoom/pan functions for viewing the art, and being able to easily click on the artist's name to go to their NG profile for potential follows and seeing the art in its original NG page (if possible) for potential votes. I feel like more love gets spread this way when you make things easier to interface with!
*It's wonderful that you have so many entries for this, but because the list is so long and it is alphabetically sorted, I feel bad for whoever's username starts with letters like X, Y or Z as I think they're going to get absolutely shafted in that a lot of people probably won't have the patience to get to their entries at the end. Perhaps it would've been better if there were some sort of big thumbnail gallery view where you can see many at once and click on them for more details, or a search function, or maybe the list should be randomly sorted (perhaps you could even make a fun gimmick out of the randomness, like make a mailbox gacha machine that gives letters which you open up to see their cards).
Again, well done on this and your heart's in the right place, but yeah, I'm a big nitpicker and want art collabs to do more than just the bare minimum!