The game is controlled by the mouse. To bypass the developer logo and other screens, click the left mouse button. To start a new game, select the respective menu item and click both mouse buttons simultaneously. The keyboard controls are:
Left Shift - open menu
Left Ctrl - pick up/drop item
Left Alt - make funny faces (you're a jester after all)
In DOSBox, to configure sound in the main menu, select DMA 1 and IRQ 7h.