As others have mentioned, this is a very similar game to Something Unlimited, but the Marvel version. However, I think it does some things better than SU and has potential to overcome it.
First of all, the best part in my opinion was the art. 80-90% of scenes are animated, and those that aren't still have great stills. This is what caught me over SU. Something Unlimited does not have as many animations as I would like, but this game has animations for almost every step of the "training" process.
This brings us to the next part, which is the gameplay. It is a standard trainer game, but not super grindy. You usually have to do one type of "training" ~3-4 times before you can move on to the next scene/type. This, combined with the fact that you can fast forward the scene using ctrl after the second time, means it is fairly well-paced and no part seems too long, especially since you are usually training two girls at a time at least.
The biggest complaint I would have about the game in this moment is the actual club part of this game. I only found scenes for one girl in the club, and they were amazing. After that point I was excited to see similar content for the other heroes but found none. This is something that could be expanded and feels like it is a core tenet of the game that ended up half-baked because individual content was favored. However, if this were fleshed out, it would exceed all expectations.
Another (very small) issue I had is that this game seems to be mostly filled with deep cuts in the Marvel universe. I only knew of some of these characters because of Marvel Snap, and the others were unknown to me. I think this game would benefit with some larger players in the MCU, but I understand wanting to avoid larger names for copyright reasons. This had no effect on how good the scenes were, just a small nitpick of mine.
Overall, with all this taken into consideration, I am giving this a 5 star because I was honestly overwhelmed with how much content this had. While there are some areas to be improved, this game exceeded all my expectations and left me wanting more. I truly think this is the start of a better version of SU, and that if it is fully fleshed out, it will be one of the better games on this site.