*comment your ideas* below is i hope (i wish DA would allow multiple choices to pick)

online/offline battles with ajustable timer 1 min 3 min or 5 min and boosts for rivals (player who does that to his/her opponent and/or vice versa will be given small score boost)

true survial mode

online leaderboards

orginal created sounds for supernova gem (i think it was from twist)