Great game that pays homage to both specific DOS games and the era in general.
However, there are a few issues with the DOS shareware version.
You may want to include a README for the DOS version including basic sysreqs etc.
The game is apparently failing to create \CATS\STEAM\A.TXT upon loading - you may want to remove this.
The game errors out (almost always) during the opening title sequence when attempting to play a digital sample when used with a SoundBlaster 1.x/2.0 (sbtype = sb1/sb2), at least in all current DOSBox versions/distros (74-3, SVN, Staging, X) ; SoundBlaster Pro and newer have no issues (sbtype = sbpro1/ sbpro2/sb16).