I suggest improovements as:
1. Speed Cells... (they got low production rate... But the holder has the power to send the bubles as duble speed, or more... This could be used as either offence or defence tactic... when either speeding with alot of bubles to the enemy, as an attack... OR you could send fast reinforcement to a buble you think is under attack!)
2. ... Other players will give their suggestions to new "modes" or "bonus cells" ^^,
I love this game =)
I belive you should make a harder level... Where you can choose not to see the number of points the opponent got in his bubles... and you cannot see how much points he got in his "attacking" bubles... You must guess uppon the size of the "attacking" buble how much he is sending... Also this should be the standard mode for multiplaying... otherwise it would be too hard to get back on top if your opponent got a litle advantage...