The game is neat, pretty, with a great atmosphere. However it was really hard at first, and I think the combos don't work properly (A A B B B was just holding B for me). I ended up only using the three first hit on A in normal mode and beat the secret ending. I wish Electris sometimes turned her back to hit me and that her reinforcement didn't get stuck, Pony Tail was more interesting in that sense ^^
To me, and that's only me, that's an easy take on the theme. But that's what inspired you, so it's ok! I think that if reaching the end was actually required to get the real ending if would fit better, since anyway we have to beat it 3 times to get all 3 ending.
I'm curious about the other endings, and it's nice it seems I don't have to beat an harder difficulty to get it! Also liked the dialogs between the girls =)