I love thw game so much, Jazz has the same speed of Sonic, cuz is a rabbit. It has sequel, The Jazz Jackrabbit 2. Jj2 has level editing (and custom tileset support) and online multiplayer.
Sadly its forgoten now, the latest official item is a recent Tshirt on Epic games store. To find copy is very hard because back then the only way to get the FULL VERSOON is to call Epic MegaGames (former name of company) so no stock outside.