1. Senpa is made by Mistik, not by Zeach. The creator of Agar is Zeach, not Mistik.
2. I think Senpa is primarily made by only one person, Mistik. Not by a team.
3. Senpa is not new, maybe new-ish, but not new. It's more than a year old, I believe.
I spoke to Zeach on his florr.o discord and he confirmed that he is working on Senpa.io with Mistik. You can check yourself if you dont believe me.
Also Senpa has a team, as theres multiple developers on their discord, they have devs for both Mobile and PC
Hey look! It's the roogar dev :3
What do you think?