Voynichese is a numeric cipher?

[ololololo]

It's subjective. From what I've seen in this thread, your cipher is so complex that it's hard even for you to use correctly.

To say if it's simple or not, we need some scale, let's try to establish some scale using examples.

Let's say the simplest possible cipher is the simple substitution. A more complex cipher is the Vigenère. Both of these require just a single quick lookup into a table to encode a character. I think it's absolutely clear that your cipher is way harder to use than these two. So it's not easy and not simple. Maybe it's moderate complexity, maybe it's hard, but it's certain that there are ciphers much simpler than that.

Its subjective
My cipher is a modified substitution cipher. In fact, it is the same as the substitution cipher for letters with ordinal numbers. The numbers themselves are also somewhat disguised.
On this scale, it is closer to substitution than to the Vigenère cipher. 

From what I've seen in this thread, your cipher is so complex that it's hard even for you to use correctly.

It's easy to encrypt messages. I have problems with decryption. But the fact that I tend to make mistakes plays a significant role...

If you think my code is difficult to use, you're only partially right.