1. Turrets are OP, bots with them just turtle till 15 rounds 2. Add a sort of "bank" for mercs, in case you need say a heavy for one round but need your say...sniper next one, instead of spending 2k on upgrading/trading out just get em out of the bank. 3. Make leader attack.
4/5.
+ this if you were man enough to start with "runner", we will show those nub skaters whose the real men! (fyi runner is just as hard, our jump is short as frick.)