I’ve been working on a ttrpg concept with the worling title creepy crawlies where you can play as several types of creepy crawlie, from the humblest ant to the elegant moth to the jolly cricket to the noble snail. I came up with my own cee-lo style dice rules as well.
So far my idea is that your species and class are one and the same and you can choose from specialized paths as you level up to get more adaptations. I also considered putting effort into enviromental hazards, from rain to carnivorous plants. When you are a creepy crawly, even a trip across from the tomato garden can be hazardous.
My main concern is the rules about digging and flying, because I want to put bees, wasps, butterflies, moths, etc. in the game.