Well, that's a personal preference for everyone. I personally think having a more difficult escape / grab system could improve the game, since otherwise there's no real risk when attempting a virgin run. That mod goes to far in increasing the difficulty, but that's just my opinion.
The base game has a pregnancy status effect, caused by (IIRC) 2 enemies, and not much else. There's a different sprite when pregnant, and there's a short birth animation. It's only slime type enemies that cause it. The mod allows all enemies to cause pregnancy, but the birthed is still the slime enemy the base game gives.
The
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is a plugin that allows unity games to have their text put through google translate (or other online services) as you're playing the game. Normally unity games require a lot more work to translate without having access to the source code, so this allows for just released games to have a translation faster. When you're playing the game you'll see the Japanese text appear and (depending on internet speed) have it change to English after the translation is completed.
You can also have someone manually edit the translations the autotranslator gets to have a better result. The current version posted has it pre-installed, so you don't really need to worry about it.