I mean, it's easy to let the NTR happen, just go in and out of the dungeon and don't screw with the girls at night. XD
Or you can work your way up to lvl 3 and, fight through the fairies and just defend.
Or fall into the traps on lvl 4.
Or hit the succubi on lvl 5.
Essentially, the NTR is something you have to prevent, not something you have to go out of your way to make happen (like... a lot of other games that I could name out there...). It just so happens that it's not that hard to prevent it. At least if you understand what you need to be doing.
Also, I'm not sure what people are smoking when saying that this game has less content that L&E. Unless you're particularly generous with how you count that game's variations, it had 43 scenes (including the ones with the MC). If you want to be really generous and count the scenes that are basically the same between L and E, you'd get 66. Though in both cases, it's worth remembering that the game has 2 patches that added scenes.
Sure, there's less scenes per girl here, but that was to be expected. That always happens in situations like this, and this guy ain't a major circle like Acerola or ONEONE1, and even they struggle with multiple characters in various ways.