The noise he makes when you click something invalid is annoying. "nyuhhh"
Other than that, I love the art style and the puzzles are pretty easy, so nobody could really complain about difficulty.
Sound design is excellent, graphically it's amazing, and the gameplay is fun. However... It is a bit too Katamari like for it to really shine.
The idea is unique enough where a few design choices would have made it truly unique:
There is a song early on that sounds almost exactly like a common Katamari song.
The boss should not have been a king, like the King of the Cosmos from Katamari.
Some of the graphic elements are, again, Katamarish... particularly the star wipe, and the intro screen.
But overall, I had fun... I wish it was longer!
Scrolling through weapons using the mousewheel gets screwed up after a single round. It appears that it is directly tied to your mouse settings in windows, so if you're scroll wheel is set to scroll through 3 lines of text, the game will scroll through three weapons. This is bad.
Also, it'd be nice if scrolling through weapons skipped the ones that have no ammo. With the amount of action going on, it's sometimes hard to tell when you're actually firing or not.
I did notice a kind of cheat...
If you create a line of spearmen out of the same location (so that you don't have any other units on the field except in the one line) the enemy will only produce units on that line as well.
So you can create a mage and spearmen and completely dominate the enemy (outside of mounted units). I beat a 100% opponent with only minor upgrades this way.
What determined when you can do a charge? It seems whichever side is doing better gets more, but I had one where we were dead even but the opponent had 5 charges where I only got 2.