i didn't look at the source code
is the block reward reduce slowing with time ?
Yes. A difference in comparison to most other CryptoNotes is that is still deflationary, i.e. miners are supposed to be payed only be transaction fees in 100 years from now or so. I do not think anyone is sure how that tailing curve should look like so i suppose devs are patient with that change. Most of other CN projects kinda decided already what is best for time period 50-100years or so from now