What a pleasant surprise
Oh look, it's a game. I can't say I was expecting much from the maker of "Press Space to Win". But this is fun. Pretty simple, like the old games you are paying tribute to, but still very much enjoyable to play.
The voice acting was decent as well. Even Rina-Chan, who sure as hell can't write, but is an okay actress. D Mac is quite talented. The other two, who are obviously rather obscure, show much promise.
I don't know if this was on purpose, but your artistic style is very rudimentary. Colors, lines, and gradients. Of course this comes secondary to a solid gaming experience, but you could brush up on that.