You are supposed to answer him by showing actual gameplay. No one is going to give you the benefit of the doubt. We've seen so many projects from people who only had cool ideas on paper and a few renders.
Remember the game Bourgeoisie? You can probably find the concept art on NMA. It was a promising Fallout clone that ended up as a crappy first-person shooter. There are so many Kickstarter scams, especially when it comes to RPGs. After the debacle of Realms Beyond, I’ve decided never to give my money to any indie team on Kickstarter again.
On this forum, you can even find discussions about some 8-bit C64 game—I forgot the name, and it doesn’t deserve remembering—that cashed in on old nerd nostalgia. Yet another kickstarter scam.
Even when, by some miracle, a Fallout-inspired clone gets released, it’s rarely stellar. You get trash like Krai Mira, or okay-but-not-quite-there games like ATOM or age of decadence, which are still far below Fallout’s standard. Then there are disappointments like Encased, which falls off hard after the first act.
Right now, you’re still at the stage of “guys with cool ideas on paper.” Unless you have alpha keys for us to try, you’re not convincing anyone.