I went through the game fast since I knew it would be a short game but I want to say something.
I'm not much into short-content and I feel much in this community too, I think is kinda easy to notice, but that's not exactly what I want to say, Imma start now.
The story don't see bad at first glance
The models are veeery good, why use such good models for short content man what the hell make good use lol
I normally say about personality but since I didn't look much into it I can't say about it, though the end seemed pretty good I must say.
I like games that you have more control, or at least seens so, example, simple things as no need to remove supergirl clothes, like the possibility to make her suck your dick without removing her top or the possibility to just use the option "show breasts", you don't remove her top, just expose her and etc, also it wouldn't be hard if you kept the animations "saved" if you still have the blowjob animation for example you could just make a variation with cloth, with breast exposed etc, is not much but it still make a difference, no need to remove skirt, just put her skirt up and put her pantie aside etc.
also try to make the options have a bit more weight like the one where you ask more money or killing the guy or not, just another thing that got in my mind now, the possibility to be more rough or not with supergirl would be good too, but that's more important if you wanna make a continuation of the story or make it longer.
A bit exploration in the game would be good too like a map or something, a bit more blood and violence would be good to, I would recommend also something like Kyra and Asha kind of relationship in Desert Stalker (game is here just search it) as reference, Asha fight is in first 5minutes of the game I think so it would be fast, try taking note of how the choices change things, if you don't have time to play the game, in resume in case you don't have the time or won't play (though I recommend very much, is a good reference) "add violence options like a good slap on bitch faces, make them suck your dick while their face/body if fucked from fighting like blood and fight markings, option to hurt them less or censor etc.".
I would give a review instead of posting this but I particularly don't like short games though I liked this one so you kinda got me "HA" so I'm posting this here because I want it to continue, be longer, I will gadly give it 5 stars if so (and please at least consider what I said, it's not hard to do, your game don't need that much improvement though being longer)
TLDR; (obviously if you've read above no need to read below)
More options, more weight in options, I want more of this game, please make a continuation or change name and make it longer, more options and more weight in options, did I say anything about options? and "exploration" like a map or menu to choose were to go or something or at least make it seen like so, more blood and violence, option to treat supergirl differently in the sex scene like more smooth or more rough, more small details in sex scenes.
If you will continue the game add violence options like a good slap on bitch faces, make them suck your dick while their face/body is fucked from fighting like blood and fight markings, option to hurt them less or censor etc.
I want to give this game 5 stars so please, please make more of it, this game has potential I can see easily.
