Seems like a step back from Epic War 4 in terms of controlling the army. No buttons to control entire army, no auto-summon, no minimap to let you easily attack/retreat the other side of the level. Would be great if it just had EW4's controls.
As others have said, your units max out relatively quickly and after they're maxxed out all the xp they obtain is rendered useless. This problem is highlighted with your hero unit. Im just about halfway through the trials and my hero unit has ~ 4k of unusable xp. By any chance could we have this excess xp go towards upgrading other units or at least serve a function?