1. Yumina the Ethereal "Forever Dreams" Fandisc -- This is easily the number one thing on my wishlist. I freaking loved the original game, so wanting the fandisc is a no-brainer. Just throwing this out there, but this is also a case where it might be worth re-releasing the original game along with it in a limited edition. Yes, that's partially the fanboy in me talking, but on a less positive note, the original physical edition of Yumina was extremely buggy (it required about five patches within 3 months, if memory serves). A release of the fandisc could also be a good opportunity to release a more finished, flawless package edition for the original. If you throw in a soundtrack, I'll throw dollar bills at you like confetti. LOL
2. The "Monster Girl Quest" Games -- Right now, pirated editions of this are selling at a pretty fast clip on eBay. The success of the manga Monster Musume shows that there's a certain amount of popular appetite for this genre right now, so I'd say go ahead and cash in on that if you think it looks promising.
3. Kikokugai The Cyber Slayer -- This is a Nitroplus title, so you already have a bit of an "in" there...
4. Anything funny. Heartwarming is great, as is action-packed, as is sexy, but nothing pulls me in like the promise of a story that will make me crack up time after time.
I look forward to seeing what you guys come up with!