Very well made
An incredibly well made flash game. A game with magnificent mechanics and addictive gameplay, combining so many elements of strategy into one fun little thing.
The enemies were fantastically spread out and their difficulty very well spaced. I especially enjoyed it whenever I made a spectacular kill on one of those later monsters that had a damage range around so many squares. It just feels so triumphant to take down something like that in one swipe without getting hurt.
One little thing that irked me a little though was the damage effect when I turned the board one way and then turned it back again the other way. For some reason it just felt unfair that I was hit twice in a row without even moving and just by rotating. I'm not sure where to draw the line on when the player receives damage. I would've suggested not dealing any damage at all for rotation of the board, but that would be too easy as well. It just felt really annoying that when I rotated the board one way and got hit, I couldn't rotate the board again or I'd die. The only option was to drill from there. Especially apparent with the scythe monsters. It's just a personal thing I found kinda irritating, not sure what to do with it though.
I think the ability to rotate 180 degrees is a little too much of a hassle to obtain and use. It's actually quite essential to the game but when I look at the powerups that come after it, I'm so tempted to not use any of it. What I would suggest though is making the 180 degrees rotation available right from the get go, but with a limit. Maybe start with like 3 available rotations in the start. Or as a buyable item in the shop. It's a really important move that one cannot do without, but it's kinda hard to actually use it because you're sacrificing the powerups you'll most certainly benefit from much later. I just think those two need to be separated - the ability bar and the 180 degree rotation.
Some of the items in the shop were a tad expensive I think and a little redundant in some cases, but for the most part it's quite well balanced. I do think that the shop needs to be more accessible from anywhere. Since it doesn't really mean anything to move around completed areas, it's kind of a hassle to go back to the shop again and again between battles. Make things easier and just make a shop button. I know it actually doesn't make sense then, but it doesn't need to.
It's a great game, and I'm just nitpicking really.