The shareware version includes five levels out of 25 in the full game.
To get the sound working in DOSBox, use the JEMM386 memory manager:
1. Download JEMM578B.zip and unpack its contents in a folder DOSBox will recognize.
2. In the DOSBox configuration file (dosbox.conf), turn off all types of extended memory (xms=false, ems=false, umb=false).
3. Run DOSBox and load JEMM with the following command "JEMMEX FRAME=E000 LOAD" (without quotes).