Hey there! I played through the game and I thoroughly enjoyed it. It had great quality, so I feel the need to leave a great quality review:
I felt overall, the game served its purpose: a playful ecchi space romantic comedy. I saw the Protaganist as the classic Romantic Comedy/Harem anime hero, despite his serious demeanor. When put into a compromising situation, he reverted to Keitaro-mode. "Ahh---uhh...".
The characters were...hmm...I dunno, a little lacking, to tell the truth. The game was very short, so I only got to see a very small bit of each character, but from what I could see, they were all relatively two-dimensional, and not exactly likable. Then again, I'm female, so maybe the fact that I wasn't attracted to any of the characters physically took away from the experience.
I mean, seeing a girl's panties doesn't really do it for me. XD
Jade was the one I liked the most, and even she got on my nerves slightly. Rose was quirky and strange, which was definitely a change from the serious Jade, but at the same time, she was slightly annoying in her ditziness. XD Violet was just too bitchy for me, but hey, tsunderes are a must. Perhaps the problem was that all the girls received very little screen-time, so they came off as two-dimensional.
As for the designs, I like all of their hair and faces, but the uniforms were...err... To tell the truth, as a woman, I was a little offended by their attire. (Not seriously of course!! More of a "Hmmm..." than a "OMG HOW COULD YOU?!") I mean, these women are supposed to be serious military personnel, Jade especially (is she supposed to be the First Officer?) and they're wearing these little mini-skirts. I appreciated that they wore tights, but the skirts were just too short. I agree that perhaps having an arm-band or maybe a couple badges on the shirts would have made them look more professional. The outfits looked a bit casual at first. As for the skirts -- women in the American military who wear skirts often wear tasteful pencil skirts or knee-length skirts often made of the same material of their uniform jacket. Either that or pants. Now, I realize that this game has a bit of ecchi in it, so the short skirts appeal to the intended audience, but it takes away from the reality of the situation. When I first saw Jade, I didn't believe she was a military officer wearing that outfit. XD But I believe there's a way to make a military uniform sexy without having it be silly looking.
The music was spectacular, as were the sound-affects. I wish I could say more -- they were just great -- I felt everything fit perfectly.
The quality of the art was stellar, and the backgrounds were a great change from the usual. Awesome job!
I have yet to get ending 3, but I'm working on it.

Overall, great job -- can't wait for the next installment!