seeing that all Rocket games use the same FMV engine Wingnuts , LoadStar ... used this help ... vogons.org/viewtopic.php?t=17988
and they first check the video speed if its too low it crashes, if to high crashes ... but if you set the cycles in your dosbox to 2000 just for this first screen check it goes past it , when you go to the endresult screen Press Y ... then in the Rocket Logo FMV set the cycles to 6000 ...
and the game should work now ...