Smae issue as previously stated
Positives: The concept is a new twist on an older game style, and was fun at the start. Animation and sounds are quite good, and the music is pleasant rather than annoying, even though it's repetative.
Negatives: Doug really does become too difficult to hit, and if he's able to move from barrel to barrel in one second or less, and it takes several seconds to get the bartender to respond to a click, it just doesn't work. Upgrading the weapon didn't seem to have much of an effect since the levels go by so quickly (and apparently with each level comes a more difficult to defeat Doug).
Suggestions: Tone Doug down a bit more than you already have, please. It got to where he was drinking nearly all the ale before I could even get a single hit on him. Also, if you want to keep Doug fast, maybe allow for upgrading the bartender's speed rather than just the type of weapon (as stated, I can't tell if the upgrades had any effect at all anyway).
Overall, not a bad game, but too frustrating to be "good".