This is great! Clever puzzles with great sprite work and animation and an interesting story on top. I was a little confused at first and it took me a bit to get the hang of how the shadows work, but once I did it was a really cool mechanic with room for mastery. I wish there were more levels, but I did go back to get all of the achievements, both to uncover the lore and to test my skills with a better understanding of the game.
The basic style of the game reminds me a bit of Ronin, another action puzzle game, but of course the execution and mechanics here are totally different.
Sorry it took me a little while to check it out, it's been a busy year.