SSI's old Battle of Antietam for the C64 was groundbreaking in its day, as is this game in 2015. There really is nothing I can compare it to. HPS ACW games are respected classics, but the pace is slow and the micromanagement high. Not that this game is short on counters. But it moves along briskly with WitE-like data and stats if you want them. Scourge of War is also excellent, but it's a nice companion game, not a competitor to this one.
Admittedly, it will take me awhile to wrap my head around the command hierarchy for the larger scenarios. I have modded in some "independent" units, that while ahistorical, allow some experimentation while learning the system. It appears these lone wolves can be given just the orders you want at the critical time without affecting an entire brigade, etc. The last several hours have been full of pleasant surprises, and I love the fact you can continue the battle if you like. Really a lot more to discover, and thank you for putting much of the data in our hands.
Having a pretty good feel for Matrix's customer base, I can't imagine many wargamers - ACW or not - being disappointed with their purchase, even though some polishing is always needed. Your success will directly impact our future enjoyment, so I hope the game can saturate the Matrix market, as Steam isn't in the plan right now. Anyway, it's one of those products that can keep you up all night, and I like the buzz!