It's a bit buggy, with a lack of ability to deselect attacks rather negatively impacting how it plays (and my attempts to work around that being how I discovered the bugs, mainly it glitches the heck out if you select a unit and switch back while in attack mode). But honestly, it's not half-bad as a whole.
Viewing post in Out of the Breach jam comments
Thanks for the feedback!
Currently you can deselect attack / unit by pressing the right mouse button. I should have put that information somewhere in the game, my mistake. I'll also add a "Cancel" button, visible when in attack mode. That should make it more clear. I also forgot to disable the attack when switching units. It will be fixed in the post-jam version.