Contains spoilers:

Having not read the manga: the OVA suggests a possibly-complex storyline; however, barely any of it was apparent. The voice acting was bad, but it was hard to get good English voice actors at the time. I loved the art and character design. The concept was interesting, but the cuts made it very hard to follow and majority of the OVA was scenery with music or shots of the MC's life with minimal context. Many scenes repasted (this may just be common in older anime). I couldn't tell the twins apart, at all (typically, for film purposes, there would be some sort of distinction: i.e. different voice actors, heights, Fred and George in Harry Potter who are naturally slightly different with different voices and also constantly address one another by their names).

I really hope someone remakes this!! Cipher seems like it would be a great anime.

Breaking it down:

Voice acting:

The voice acting was my second least favourite aspect of the OVA. Terrible voice acting is bearable if the anime itself is good- however, this was not the case. The intonation was not the worst but definitely not professional by any means. The pauses in speech were always either too long or too short (i.e. the memed scene where one of them wakes up for breakfast and they take maybe around three shots in silence staring at one another). There was no proper emotion displayed in any of their voices- I'd even say that the scene where they're being slightly 'over-dramatic' in terms of voice acting to represent the character themselves acting was better than the rest (but still not very good). Their tone was off as well- I'm not sure how you'd fix a tone of voice as I'm not a voice actor or singer, but the tone had a childish tinge to it which made it harder to become immersed. I also believe that the voice actors for the twins should have been different in order to differentiate the two- it would have added character and been more immersive and easier to comprehend.

Art and character design:

I loved the art. For its time its good art, and for today it's nostalgic art. I would, again, prefer if the twins were made to look slightly different though. One thing that could have been done is maybe have adult-looking twin always wear glasses while the younger one doesn't. (I think the older one has a ponytail though? I can't tell anything at all from the OVA so I can't say). The character design is really good, each character was really cool looking. There should definitively be less scenery shots, but I think that's less of art/character design and more of the concept's issue.

Other (idk what to label):

An MTV style OVA sounds like a really cool and interesting concept, but it was not done well at all. There were way too many cuts to follow anything that was happening: I couldn't tell what was the intro, ending, or storyline. There was not enough showing- where the plot is explained visually- as well as not enough telling either- where the plot is explained through words. For example, there were a bunch of shots of the twins in their everyday lives (bear in mind, these shots didn't tell us much about what they did in their everyday lives and instead focused on showing the twins off from different angles) that were placed in between two shots that referenced

Spoiler, click to view

the death of their mother- by showing the funeral-

past trauma. Another example is the array of football clips that, even now, I don't know if the main character is a football player, an actor, or this was a diary of his? We also got that the setting is New York (or Los Angeles, I can't tell anymore since they intermingled the story with cuts) without the 50 different shots of the twin towers and Washington Square. Maybe around approximately 27 minutes of the OVA was actual storyline (debatably considering I understood none of it), and the last approximate 13 minutes were credits/behind-the-scenes. Majority of the 27 minutes of 'story-line' was music and scenery. Maybe around 5% of the OVA actually showed anything understandable.

I have zero clue on how much effort was put into this and how much effort it takes, I apologise if I've said anything wrong.