I have some suggestions for senpa.io on mobile cuz it's hard to play.
1st. Make mobile players the ability to spectate to spawn near their teammates
2nd. Try to develop a way to playing without joystick (as blob.io) a lot of players are used to it and you can bring lot of players to senpa.
3rd. Make the ability to switch your cell in dual with volume buttons (a lot of players are used to it)
Thanks for taking the time to read my message, have a nice day