Wow that looks great! I especially like the unique traits and the beetle treats. I almost implemented something about treats in this document actually.
I'm pretty busy with some other Mausritter projects right now, lot of paintings and playtesting in the works for a big setting/adventure supplement I'm working on, along with some other personal art projects. Could be fun to work on at some point in the future though, or if you wanted to continue with it that would be cool too! Looks like you've got some great ideas already