I fell in love with the GUI!
The way you put everything on one screen is awesome. The space for borders and other UI elements, and the game, are very well-managed. It gave me lots of ideas for my future projects!
Considering the visuals, everything looks in shape. The color palette is well-selected and perfectly reflects the "croakiness." The audio is also great, the sound effects especially. The resolution restriction also seems to be perfectly handled!
Well-done!