The gameplay isn't particularly enjoyable or interesting, but this is really a perfect example of a game where the focus is on the scenarios, custscenes, and animations, and not interesting gameplay mechanics. Most games like that tend to offer no real reason to play, as you can get the same enjoyment from just watching videos of it, but your choices of how you retaliate to each attack causes a different response from the enemy, allowing you to really tailor the cutscenes to your taste. On top of that, you can disable some elements of the game to avoid scenarios that aren't to your liking. Everything is extremely well animated, and the developer has a beautifully sadistic mind that she really seems to enjoy exploring. This is definitely a strong contender for the title of the best giantess game in my opinion.
Update: due to the the complete lack of any worthwhile progress in years, imma have to retract the positive rating. This was super promising and an extremely great start, but the dev has made no progress beyond that point. Now, they're just another scammer who makes false promises in order to steal money from whoever falls for their lies. What a tragic downfall.