It actually never had that dependency, I don't use the wiki or any other source for game assistance without a time crunch in real life, just to translate things that aren't English like the little bits of Japanese text. If you read carefully ALL the text in game and level each girl, both main and side, as equally as possible in ALL stats, you don't run into issues with not being able to trigger an event unless it bugs out, in which case you just have to post your save and someone will take a look. In the case that you do the above and it doesn't bug out, you should be seeing every event without issue, though watch out for going too far with the stats or you'll turn the game into a non-interactive slideshow for several events as you have met the requirements for multiple in that case, which could lead to missing events in cases like the original beach event, where you had to avoid doing a specific event until the beach event was over and having high enough affection on the girl with the event you needed to avoid could force you into it in a way.
There's a few out there, kind of wish there was a tag for the use of Koikatsu as the graphics engine now. The developer of it isn't a native English speaker, so you might see mistakes there and could face trouble depending on how well you can piece together his writing when there's something not quite right, but Winds of The Destiny was pretty decent when I tried it last. At least, I'm pretty sure it uses the same graphics, though obviously not the same character models.
I believe it is referred to that way because the developer made it specifically in response to the Denpa aspect of this game to give people who don't like it an alternative.
I actually don't mind Out of Touch, it's also decent, but you are in for a surprise if you prefer to be the one on top and I don't mean physically. Also if you prefer not to be raped since, yeah, that's a thing that happens in game. It definitely isn't lighthearted, but I would definitely not put it as far away from being lighthearted as I would this game.
I can't really make much of a judgement between the two on music since they both use royalty free stuff or stuff they specifically got permission for that existed before the games did as far as I can tell. I'm a sucker for original soundtracks, so I'm kind of biased against the use of existing music of any kind.
Yes, I don't remember any point where old saves weren't compatible.
That is true, but that's still technically answered by Lolicon Kami and I since old saves do work in both cases even with any extra steps for getting the Android version to work. The Android version is really just the Windows version being played via Joiplay at this point. Remember, the game is getting to the point where an actual APK is becoming less and less possible since Android hates huge APKs.