I won! I love the graphics, you never disappoint!
The movement feels good, the UI is easy to read. The health bars for the characters is a good touch, almost necessary in a game like this. The animations are crisp.
[SPOILERS]
It actually gets easier the longer you play, because of the enemies spawning from the flags that you are destroying. I was able to stack attack power, get the heal ability, and then I was golden. Once my attack could one-shot most of the enemies, I just ran around and killed the flags.
One thing: It would be nice if the upgrade selection screen could be done with keyboard - your gameplay controls require two hands on the keyboard, and switching to the mouse to click the upgrades, and then having to switch back quickly to keyboard controls killed me several times at the beginning. Or, you could have a little time delay before switching back to the gameplay to give the player some time to get set again.
Over all great game. You did a ton in the time you used. Glad to see you back again this week!