Yes "Gnosia" is amazing. If it weren't for it I would have never made "Null".
It did the whole "Time loop" thing perfectly and Setsu is best girl of all time .
The only negative thing in "Gnosia" is the lack of more story and in depth dialogue since "Gnosia" isn't a typical visual novel.
So I tried to make "Null" a mix between "Gnosia" ( with the time loops) and "Raging loop" ( with the deep lore) and finally added the usual "Happiness" touch when it came to making the character interactions as realistic and raw as possible and making a bittersweet ending.