I have done playing (P)lanets! And my impression is, it's just as great as I thought it was! You really didn't make me disappointed about it at all, and it even actually made me thought of it a few hours.
In the first gameplay, Kaius seriously got my attention. Personally, it's because he is my type, a red-haired tsundere. And to me, he seem to be the main male character for this game, because his story fits the most. He's the son of the Principal, alone and away from society with only Marin as his friend, and his past is very very sad. When I found out, I actually feel very sorry for him. Too bad that part only came up near the ending, or else I would definitely keep looking for him when it's lunchtime. And right now, he's my favourite character, you develop him so well throughout the game, and it seems he changed completely after they are together, and the part when he tackled Marin made me smile. And since he fell in love with Marin, I guess he's the 'cold but gentle deep down' type of guy, I'm sure he considered her cute, just like how he thought of the kitten :3 Oh, also, you got me off-guard there, when Marin said she was ready to do 'it', I was thinking the same thing as Kaius. Oh Marin.
After that I went to go for Ryuu, and I figured as much that he was hiding something deep inside after all. I think he's the only character that still have a sad life during the game, knowing that you are sick and probably die anytime soon isn't something to be happy about. It's just that I guess I got used to anime, only a guy like Ryuu will be a sad sad person (reminded of Fye from TRC) when they reveal themselves to you. I'm quite surprised Ryuu doesn't, instead he was able to remain smiling while telling all those secrets. But I still don't get why he's so mad at Kaius, but then again, unlike others, I enjoyed their fight, it's like the case their admiring each other but showing it with disrespect due to jealousy. And I must admit if Kaius weren't around, Ryuu would be my favourite as well.
Then I went ahead for Lucan, surely because I wanted to know his inner problem. During the first few meeting with him, I was happy to be with him, but not as happy as those two, well, that's personal matter. I remembered that during the other gameplay, he was saying to he'll go to see his family. And I was able to guess about it by then. While at first I thought his ONLY problem was his fangirls being around him, and not giving him time for privacy. But then it surprised me that his problems were much deeper, and he was also hiding his feelings towards Marin only because of Ryuu, which explains some parts in Ryuu's route. I wasn't sad when Lucan got expelled, because, yeah, I already knew I shall be joining him soon. But his epilogue was the best, and it seems that Marin finally got cooking skills!
Last but not least, Haruhi! I read the spoiler, but yet again I was so surprised that Haruhi really looked like a cute little girl, I was expecting a beautiful lady as Haruhi xD Ehem, anyway, I was a bit dumb for keep playing and skipping the game, I forgot I can save! I had to repeat Kaius route until I had to say 'bye bye' to him ;_; But Haruhi's reasons for being a girl is acceptable, he's not the first one I met now. But soon after I see the Male Haruhi, I thought, 'Oh wow, another cute guy <3' I was wondering thought, did they even got to bath with each other? Haha~ And again, you got me off-guard when Haruhi said he wanted to prove himself to be a boy, I think I read the word 'shirt' as 'skirt', and I was almost scared just like Ryuu and Lucan.... until the picture appeared. 'Wha? ..Oh, a flat chest', was all my respond. I'm a bit curious, how did Ruiko found out he's a boy? Just by looking?
I guess this is a bit off, but I was curious about how Marin got her power. Is it because she's smart? And did she lost her power because she lost interest in studying? She did spend a lot of time with the boys a lot more in Planet than studying. I guess there wasn't a lot of things about Marin herself in this game. To me, it's just lacking of the main character's development. That's all.
Anyway, I must say, even though you did this because of hobby, you did put a lot effort into making this into game, and I like it a lot! I don't play a lot of otome games, but I'm sure this would be some of those I'll remember after Alistair. I have that bug about the image overlapping as well, and also didn't see the pet store. I don't mind about the art, no one is 100% perfect. Others will sure enjoy the game because of the story. And most importantly, congratulation for finishing your game!