Also should have a way to get rid of the cards you have more than once like for example enabling a shop where people can put ONLY their duplicate cards and then when other players put theirs, they are automatically changed...
good game but needs some improvements for eg: send waves whenever u want, speed boosts,better graphics and gameplay, a bar showing enemy health and very much more
if there will be kongregate racing 2 it shall have, in game chat,lvl creator like platform racing 2 more blocks,better gameplay, minimap, costumisable avatar and points to spend to make urself better.