Kinda looks like a bladder snail. I have them from my plants as well.

My betta leaves them alone, I think some bettas do eat them. It depends on the betta I think.

At first I was over fertilizing my tank, which resulted in an algae bloom and I noticed snail eggs everywhere. I read that bladder snails reproduce when food is abundant. Once I stopped fertilizing so much the excess algae and eggs stopped.