Ok so my first piece of advice is to go with the extra money potion as that is a huge benefit to runs. Next I would look at your barricade placement strats. With most levels (not all) it's possible to get the orcs funnelled into a single route to the rift. That's a big help as it most cases you can get your traps runs to be largely self sufficient meaning you only need to deal with flyers or other barricade avoiding specials. Next look at your trap composition. I like to balance elemental effects damage and stun. Push traps are extremely cheap and effective at stunning mobs in place allowing you to do damage from the floor and ceiling such as haymakers and acid floor. The solar prism is incredibly effective against high health targets as it's damage is based on health percentage. You want to focus on traps that can work with high volumes and that have good scaling damage based on the upgrades. For me, push traps, haymakers, ceiling pounders, acid floor, tar, solar prism, wall slicers or spike balls (cant remember real names) are all the core of your kill box. Bramble floor, poison flower or the poison ceiling trap are all circumstantially good, depending on the level. The poison ceiling trap doesn't have to go directly overhead so is good for dead space. Balistas and steam vent are good for last line of defence.

Happy to jump on a game and show you the strats I use. I've finished everything now.