This used to be my favorite game but I have forgotten the name. Basically for each level you can buy different types of soldiers which can be leveld up which gives them upgrade. The gameplay is you start at the left side of a map and have to kill these bad guys (pretty sure they all wear black if that helps) you also try and rescue citizens, and have to rescue VIP citizens in order to pass the level. You can switch between members of a team (that you select before the level) during the game. If one of your units die you lose them permanently and you have to buy a new one of those units. If anyone knows which game I'm talking about it would be much appreciated
Things I forgot to add before: - game is 2d sidescroller - buildings can be damaged/ destroyed which leads to them falling on top of you or other people and kill them