Here's Cosmic Fantasy 2.
Cosmic Fantasy 2 (PC Engine CD/TurboGrafx-CD) -- patch v0 (3/21/17)

Tested all the way through, albeit very rapidly and with a lot of cheats turned on...
Changes:
Turned out not much was changed in this game. I hit up all the usual suspects (enemy stats, MP costs, item prices) but the only significant changes I found were to the first and last few bosses, plus the cutscene with Rim flipping the bird.
On a side note, I think there are two revisions of the English edition of the game. There doesn't seem to be much concrete information due to the game's obscurity, but basically, the US version doesn't translate the Japanese version's "This treasure chest is empty" message. However, there's a chest that's empty in the Japanese version, and a guide on GameFAQs mentions that that chest displays a single kanji when opened in the US version (which I've verified is what happens when any empty chest is opened in the US version). Yet the version of the game I used to make this patch instead places Bingleberries in that chest.
tl;dr If the patch doesn't work, you may have an older version of the game than what I used to make the patch. If you do, please get in touch with me.
I'm now playing Lunar: The Silver Star Story (expect this to take a while). I didn't realize it was basically a completely different game. Why the hell didn't Luna get on the boat in the first place?
I really like this project. 
Looks like Working Designs released quite a lot of games so you still have work to do
Keep it up.
Haha, I'm not expecting to get through all of them, but I haven't run out of interest yet. Thanks for the support.
thanks so much for the patch for popful mail i tried playing the original and it kicked my ace i almost gave up until i came across this patch you made, now its like one of my favorite games 
Well, that's the kind of success story I like to hear! Glad you enjoyed it, weird little game that it is. I should play one of the original home computer versions for kicks sometime...
Thanks so much! I'm impressed by the number of games you've covered already, fantastic stuff.
You're welcome -- I wasn't expecting to get this much done myself, because checking these thoroughly for changes takes quite a bit of work. I'll keep it up as long as time (and my patience) permits.