This is a very interesting game. Firstly, the style is top-notch, especially for a game-jam entry, I like the movable windows, it would be interesting to have more of them or a mechanical reason to move others besides the flip window. Speaking of that, I feel the flipping mechanic is honestly more tedium than anything, there's no penalty for wiggling away until you get what you want. Damage is sometimes unavoidable, I feel like this could be negated with either a shield option given at the start or some kind of "retreat" action that moves you in the opposite direction that you are facing.
There's a lot of mechanical depth in such a one-dimensional battlefield, I am impressed by the need to plan each and every action carefully, and glad that friendly fire can be exploited. One bug I did notice was that enemy intent was sometimes contradictory, the square they highlighted for movement was opposite of where they actually moved. I see other people had problems with the perks, I only ever used backstab, and it worked fine.
All in all, a really solid entry, there's certainly a few weakpoints, but definitely a game that stands out from the rest of the pack. Solid work, and I'll look forward to more from you in the future.