What have I achieved since then? Why, I've only learned the language's katakana alphabet, that's all.

Granted, some folks learn both of these alphabets--er, syllabaries--in week or less, but neither my brain nor my schedule would allow for that.
Anyway, as a result of my two-to-three-week dedication to enhancing my ability to communicate with the world (ha!), I can now speak, read and write (with proper stroke order!) all of the Japanese language's hiragana and katakana characters.
As for what's next: vocabulary and basic grammar, mostly by way of the first volume of Genki's An Integrated Course in Elementary Japanese.
I'm also going to take a Twitter friend's advice and stick Post-It notes with words like "chair" and "lamp" and "vase" (in Japanese, of course) around our house in order to speed up my comprehension of such everyday terms.

Will any of this help me learn enough Japanese to at least fumble my way through games I've always wanted to play, like Tengai Makyou II: Manji Maru (PC Engine), Shin Onigashima (Famicom Disk System) and, er, Royal Stone (Game Gear)?
I have no idea, but I'll do my best to keep all of you in the loop either way.
See also: 'A long-overdue update RE: my quest to learn Japanese'