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[my humble opinion] games like these have evolved beyond the point of unit management and really should be moved forward into strategy management. ie: what are effective strategies to win, and how can those be incorporated into gameplay. this game would be better received 5 years ago, but the design seems like its set back in time. there are some simple suggestions listed above which would be a good starting point... or as i would suggest, take a step back and look at the bigger picture.
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It needs a Rally-point and select all. Also the option to deactivate unit-Spawning for certain towers. Why cant we upgrade units, I was sure to see something like that ingame, but only spells?
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Need to cut edges a little here and there. But after all, it's still a nice gem. First, it miss select all button. There's so much clicking my mouse hate me now. And a little AI would be nice. If you see an enemy 2m next to you it's quite wise to attack instead of waiting. Anyway, It's a good game, but need a little work.
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I do rather like this... But either a rally point or a select-all button would be nice. Or, even an auto-move which sends your units towards the nearest enemy unit/building.