What is the letter ranking base on, anyway? I get an F every time, even after managing to beat the first boss. As a new player figuring out the game, it kind of kills my motivation a bit to always be scored at the very bottom.
Also, I can't seem to quit the game other than setting it to windows mode and closing it manually. Is there a menu option I'm missing?
Aside from that though, great fun to play and the music is fantastic. Also cute frog.