a defense mode like game play would be fun i think
preferably endless ... not like cop bot destruction
but protect something and keep it as long possible either coop or solo play ......
with weekly or monthly leader boards ...and a reward for the top player of the month or the first 3 places .....
in defence credit bonus drops ,,maybe weapon upgrade like in bot destruction
maybe rare item drop for using in on your mech ,,cosmetics or other visual thinghy's
or a early weapon unlock for new players
an idea ,,i dunno