I heard you're planning to stop working on this, so I guess now's my last chance to play it after eyeing it for so long.
Played it for like two-three hours? Had a lot of fun going through the missions with Diversity Squad trying to beat everything with no officers down until I got to the Cleansing the Rot campaign and got bodied hard for an hour by the combination of teleporting insta-respawning instakill liches and stunlocking mimics in tight quarters.
My verdict: This is a fantastic game in concept, and a really good game in execution except it's way too hard.
Like sure, it's got some issues with the friendly AI and the quirks of using doors and items and some notable missing options like a way to see through doors, but the only reason those are aggravating instead of just a minor annoyance is that you're up against hordes of fearless aimbot murder machines whose only hobby is holing up in a room and pointing a gun at the only entrance while sipping coffee to keep their reflexes sharp.
Like, for comparison, SWAT 4 starts you out with like 3 armed suspects spread out in a two-story diner. Here, you're up against ten gunmen in cover with no alternate entrance before you've even finished the tutorial!
I really think all you need is to tone down the difficulty and you'll have a classic on your hands.
I hope you figure out a way to finish it in a way that satisfies you so you can publish it.