Thanks to the dev & uploader for a fun little game! Here are my thoughts:
Likes:
1) The model was beautiful and well posed (no jacked-up faces or anything).
2) I like that your game incorporated actual gameplay and that the gameplay didn't distract from the sexy stuff. I hate games that make me miss all the dirty stuff because I'm too focused on solving a timed puzzle.
3) I'm glad that there was a choice of games. I don't generally play Sudoku and I feel like people who have practiced it have a HUGE advantage, and people who don't are basically doomed. It's definitely a game where experience counts (unlike the others).
Suggestions:
1) Minor: There are a couple of typos. You may have already fixed them, but I saw one after the first animation and one in the ending credits/behind-the-scenes thing.
2) I played the memory-match game the most (because I wanted to win, dang it!). The difficulty increase didn't exactly feel smooth. If you have the same total number of cards, doesn't matching 4 of a kind actually make it easier rather than harder, since you clear more cards with each combination? I don't know - Maybe it was intentional and the last couple of puzzles were easy because she just really wanted an excuse to use that mouth.
3) More! More games and a choice of models or outfits would be fun. I know you are basically just using this game for practice, but adding more systems & choices might be good practice for you and it would be fun for the player. Hangman is fun and could potentially have varied difficulty. I'm sure there are other good options - that's just the first that came to mind.
4) Big One: If you have hardware limitations, I'd suggest that you stick to still images. It would allow you to make a wider variety of images at a higher quality. For this game it's not a big deal, but if you do indeed aspire to making a longer game, like a visual novel, having a TON of images will enable you to add more depth and interest to the game than you would get with minimal art and a few animations. It could also help to even out production times - not necessarily speed things up, but at least make it easier for you to put out regular updates, rather than a quick easy update when you add gameplay features followed by an agonizingly long update when you add animated art. I've seen games that aren't really that great get a lot of attention and support because the fans can see frequent, quality updates. Once the updates slow down, people start whining (or at least expecting a LOT more from each update) and your game becomes less visible. Personally, I find most animations of rendered art to be deeply disturbing - unless they are insanely high quality they usually go right off a cliff and just absolutely crater themselves in the uncanny valley. I'd rather see some pretty stills. You could always patch in more animations after the core game is finished (or sell as a DLC if you opt for that kind of model).