Yeah, it's oldschool style game, something like Metroid, as you can see, but better. I liked everything about this game (except how long it takes to kil enemies, so I can recommend you to cheat a bit, game is anyway pretty difficult).
Graphics of this game, makes my eyes very happy.
Gameplay is not boring and lasts for 2h, if you want to clear all map and watch h-scenes a bit (like I did).
Controls are good and responsible, but a bit too much, for a keyboard that can only do 2 actions at once.
H-scenes... ahh... finally some not disgusting rape... So I liked them alot too (boner guaranteed)
There is almost no plot. but it don't even needed (I guess).
Anyway, I really recommend you to play it and cheat a bit. It's a good porn 2d action metroidvania.