In Original Games, don't you mean games developed by your studio? Yeah, Plinko, Dice, Hi-Lo and other games are listed as Original Games on other casinos but they are named Original because these were the first games of crypto casinos and at the same time, they are developed by the casino studio.
Original games in this context are games built by the casino itself or we can say these games are own-built. It does not need to be a first ever game in gambling industry to be built and launched for gamblers. There are many gambling sites with dice games, but if for example EVO.io team built up their own dice game, it's their original game.
Btw my opinion is that crypto casinos started with Dice and Crash but Crash was mostly only on Bustabit. When I think about Dice and Crash, crypto comes first to my mind. I can't imagine playing Dice on a fiat casino and I have never seen too. You should definitely build a Dice game.
My priorities are the following listed in order: Dice, Crash, Plinko, BlackJack, Roulette, Keno, Mines, Hi-Lo and Wheel of Fortune.
Some start with dice, some begin with crash, and some others debut their business with sports books for their users. No gambling platforms are the same in their ways of launch, develop and expand their business.