Hey all, the game seems to be unplayable when in full screen. Both the graphics and the music slow-down horribly. It is somewhat more bearable when playing in a window that's been shrunk. Any help? The games are working great when played in an emulator like Visual Boy...

I have the same problem. I have to play in windowed mode or else it runs at like 10 fps.
Between that and no controller support being included for the games, this feels like a really shoddy cash grab.
Honestly, I bought these games because I love 2D Castlevania but if I hadn't already played these before this would be unacceptable, especially from a major company like Konami.

Even in windowed mode, sometimes the framerate drops and my computer starts getting hot.
These are GBA games, how on earth can it be this hard to run???