Now the creep upgrades are somewhat fixed I would like some more upgrades/better upgrades.

Usually you get lvl 1 gold and towers and then spend all gold at creeps, and sometimes xp 1. Wouldnt be awesome if we got some varied upgrades instead of same effect for higher price. Some really good defence upgrades would be cool, so that the famed comeback was actually possible.

Also trebuchets are, in my humble opinion, useless. They do almost no dmg, they usually fire at wrong people and they cost 6k. They should be upped immensively, same with finger of god. Everytime someone buys these I get tears in my eyes as ussually the fortresses are destroyed already. 

In short buff trebs, that would give the defensive team something that could sway the game in their favor.