Sounds like Japanese

[zyma]

But most of those are in different syllables (or long vowel such as えい and おう). With diphthong in every syllable it's like american accent taken to extreme.

And?

VV doesn't necessarily mean diphthongs.

[svld]

And?

VV doesn't necessarily mean diphthongs.

And?

VV can be two different syllable without consonant in between or long vowel or W or something but what is the thing if
1. Syllable Structure: CVV
2. the two vowels must always be different.
3. the VV is not a diphthong

[zyma]

And?

VV doesn't necessarily mean diphthongs.

And?

VV can be two different syllable without consonant in between or long vowel or W or something but what is the thing if
1. Syllable Structure: CVV
2. the two vowels must always be different.
3. the VV is not a diphthong

I don't understand what you're trying to say here. I think there might be some typos?

I'm also starting to think we might be talking about different things. My point was just that Japanese allows vowel clusters, even though it doesn't allow diphthongs.

[svld]

I'm also starting to think we might be talking about different things.

That's probably the case, all I said is about two different vowel in CVV syllable structure.

[clawgrip]

In Japanese, any vowel can follow any other vowel, in sequences of theoretically any length. It should be noted that えい and おう can represent both long /eː oː/ and /ei oɯ/ depending on context. That being said, to say that Japanese "doesn't allow diphthongs" is debatable. The language is analyzed and often spoken such that vowels are entirely separate, in some modes of speech the vowels can merge into diphthong-like sequences. If we're going by what it sounds like (according to thw OP) then this seems somewhat relevant.

[zyma]

In "standard" Japanese, aren't all vowel sequences "supposed" to be separated by hiatus? That's all I meant.

[Micamo]

To answer the OP's actual question, there are two good answers here.

1. Ignore them. Your lang is plenty different from Japanese and anyone who says otherwise is obviously ignorant. (No, I'm not bitter about the whole "Haneko is Japanese" thing, why do you ask?)

2. Allow any type of coda other than /n/, especially plosive codas.

[clawgrip]

In "standard" Japanese, aren't all vowel sequences "supposed" to be separated by hiatus? That's all I meant.

Yes, but Japanese is tricky because it works partly on the mora level and partly on the syllable level. So sequences like /ai/ often end up pretty much like diphthongs. In a word like, say mainichi, the /i/ should be as long as the other three morae, but in actual quick speech, the /mai/ can be reduced in length so that it is nearly the same length as either of the other two syllables. I'm not sure this is entirely relevant to the discussion since people who say it "sounds like" Japanese probably don't know enough about this for it to matter.