plain awesome!
Nice work on the engine, and I like the zooming effect!
the skill tree was a little hard to understand at first, but eventually I did :)
1 thing, that shouldn't be hard to add, but would help alot: on the 4th level boss fights, after you choose the skill the counter goes to max :)
All in all - #1 game of the year (and it's just the start of 08!)
Great job!