It was okay, but it came pretty late to the game. Undertales done the the whole "mess with the game code" thing before, and Madoka's done the whole "cute show that's actually fucked up" thing before. It was nice for what it was, but the characters felt underdeveloped, and the narrative as whole felt like it was missing some meat. All it really had going for it was that twist half way through, and that's undermined by the trigger warning.
But I liked it, and it was effective at what it was trying to do, and it was *free*... So I can't hate on it too much can I? I got more then my money's worth. It's not the best VN I've ever played, but I reccomend it.