the game runs perfectly but when i start the program the sound doesn't appear and i can't play the demo
There are a number of compatibility fixes in the Steam build published for Next Fest that haven't yet made it into the itch.io build. You can try the demo now on Steam, or wait for the next major release of the demo to be published here. If you would like help in the meantime, please join our Discord server or contact us at the support email address on the disclaimer screen. Thanks!