Just played the Alpha, and it was great. I absolutely love the way the tiles blend, it's very nicely done. There were a few little errors, as you'll see in the attached images (SO AWESOME I can actually do that now), but it's only an Alpha, so it's early days. I'll be sure to keep giving feedback, lol.
Oh, yes- the sprites are brilliant, seriously. Not saying that because I did some (like, six), but really, they work out so well. I'll be keeping an eye on this, as I'm sure you know. Good luck, dude!