I thought this was already here?! ah well....
Lets see if I remember correctly: No harem route, you can get caught cheeting on your BF/GF and they might leave the island. It does allow for same sex relationships with both MC's. The english actually is quite passable , its a mix of people doing legit partials and polishing up so its fairly easy to follow.
As for aid I could give... Little white flower behind city hall means someone is going to leave the island, if you dont want that, pay money and pull it. Characters with a chaotic alignment will have sex without needing to be in a relationship, so if your aiming for harem island design your decor towards dark and chaotic to attract those characters. Oh right! the overall layout you design determines which type of characters show up to live on the island.
Thats all I can remember for now, have fun!