I finally broke down and bought the Penny Arcade game, since it was on sale for half-price on Steam, and completed it in one shot. It’s a fairly short game and took me just over five hours, but it was still well worth the price. My impressions of the demo held up pretty well through the whole game, and it remained funny to the end.
Combat did take a bit of getting used to once past the first area, when enemies suddenly got tougher, but I got into the habit of using more items since they’re plentiful. I had to reload a few times though, after enemies got in some lucky shots, in order to go for the Immortal achievement. And the final boss also took me a few tries — the first one, Tycho got knocked out, and the second time was successful, but then I remembered I hadn’t gotten all the collectibles yet, so I got them and beat him again so that the flags get preserved in the final save (it might affect something in the next episode).