First and foremost, here are some sites/links to look at that contain pictures of stuff (since I imagine most can't read Japanese):
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http://iharadaisuke.hatenablog.com/entr ... /17/170805
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http://ponrevival.blogspot.com/2013/08/blog-post.html
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http://www.bit-games.com/?pid=62275650
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http://d-stage.com/shop/detail.php?seq=44711
Yes they're in Japanese, but the pictures should give you some insights as well -- it gives some pictures of the book and mentions some of the things I'm stating below. Otherwise just Google for the Japanese name of the game and dig around a bit, you'll find all sorts of stuff to look at, even if you can't read the text.
Onward ho!
1. Good question. If what's shown in the video is the PC-running-an-emulator version, then it should be noted that the emulator used is a heavily modified version of VirtuaNES (many features are removed, you can't load other ROMs, etc. -- this is confirmed/factual, not speculative); as such it may have VirtuaNES's "No-limit sprites" option enabled (this is speculative). Riki would probably know.
2. hally's one of the games' (many) musicians. All the musicians in fact are fairly well-known. Riki, as I understand it, is the individual who did the programming. I don't know if Riki speaks English or not, and I will tell you right now machine translation of English->Japanese is often very wrong.
3. I imagine each musician did the music in their own way. However, as my initial post says, the audio/effect library used in the game is the
NSDL, which tends to focus heavily on
MML. MML is
extremely prevalent in the Japanese community.
4. There were many/multiple musicians involved in this game. If you watch
the Youtube video at the 1:25 mark onwards you'll see the names of the composers.
5. The cartridge purchase and the digital EXE/CD/book purchase
are separate. If you want both, then you need to pay ~22980 yen (~US$230).
Here's a Twitter picture (from Riki) showing more or less what you get (you can see the cart, and the book (what's called
doujinshi) as well as the CD). I believe it was available for initial purchase at
Comiket 86 which happened a few days ago. I believe right now preparations are being made to make the game available for purchase online or through some retailers.
And because I'm certain someone will ask it: I can't speak for Riki but it's
extremely uncommon for international sales to occur, so you would need to use a third-party service to do the purchase for you, or know someone in Japan who could act as a middle-man for you. I want to be clear: this is an extremely common thing in Japan universally, and if anyone in this thread starts bitching/crying about it I will lock the thread immediately. Different cultures/countries are different: respect it or GTFO. (Yes I am quite militant about my feelings on this :P)
6. No idea if there is a game manual (what you call "booklet") and case/sleeve that comes with the cart. I should be clear: most commercial Famicom games
did not come with cases/sleeves, they simply came in little cardboard boxes with plastic holders.
I would urge you to dig through
Riki's Twitter and look at lots of the Kira Kira Star Night posts since many have pictures.
I want to take the opportunity here to mention that there is an amazing amount of Famicom development going on in Japan in general, and has been for decades now. The main reason people in other countries don't hear about it is because of the language barrier. And that's a real bummer, because there's a lot of duplicate work/effort going on, and it'd be fantastic to combine both knowledge from the East and West (if you will). I hope during my lifetime I'll have the chance to see that happen.