You had me at "Rescue cats." Visual style is cool, although I think the scan-lines on the main viewport was a bit much (doing something like just duplicating every other line and dimmed by half, like you seem to do on most of the interface itself, would probably give a similar feel but not be quite so hard on the eyes). The UI and framing around the viewport looks stellar. Monsters are great too.
I didn't like that rotating counted as a turn, more than once I tried to turn to face an enemy, but strafed into the square instead (stupid game I played before this one with backwards turn/strafe controls confusing my brain!), and then I got attacked, and then got attacked twice more as I turned to face them, instead of getting the first attack in as I'd planned and thought I instructed my character to do ^_^. Having no queuing of movement nor being able to hold down a button to keep moving made navigating the dungeon a bit of a chore. I would have liked a little more choices in combat, there didn't seem to be anything I could do to increase my longevity, no healing or anything, so whether or not I survived just game down to luck of how many times I missed between now and my next level up :(. I got down to 2hp before my last level up, so, luckily, didn't die, but it was close!
I would have appreciated a compass somewhere instead of having to look at "moved north". The fact that the map just showed a general overview was really nice, made me feel like I had to keep track of where I was exploring, but still got a general sense of where I was.
The verticality was great, those rooms really had a nice sense of place and were fun to explore (and recognize, as I learned my way around).
There's a bug/issue where if the game is not in focus it's still capturing my mouse, so if I alt-tab to another program, my mouse is locked to a tiny corner of my screen ^_^. Overall, cool entry, glad I rescued all of the cats!