It's pretty well done. I like that the animation is smooth and that there are round and curved surfaces, but the levels could have been made a little more challenging.
I really like it, it's original and fun. It would be nice to have keyboard shortcuts for upgrading though, and the ability to place more than one creature at a time.
It costs 10 war bonds to refill your energy (which lets you do an additional two mission attempts later on). 10 warbonds cost 17 kreds, and 17 kreds cost $1.70. It costs $1.70 to get two mission attempts, maybe five minutes of game time at most! That is outrageous!
It's not quite as insanely difficult as advertised. If you want to try a really challenging platform game, try colorblind fix 3: http://www.indiegames.com/blog/2006/08/colorblind_fix_3.html
You know, whenever you restart a level, there are 3 NEW miners. Those old miners are dead. They're gone forever and they're never coming back. So, you know, be careful.
If you keep dragging until you're off the grid, then let the mousebutton go and go back to the grid, it will still think you're keeping the button pressed. Otherwise great game and I like that thought has been put into the user interface.