Couple of bugs in the original:
Wormholes are 1 use
sometimes the tank will leave a ghost image
some of the levels are impossible(?)
Regarding wormholes: They will only work if they're not "full" (something's sitting on the other end). Also, if you just warped via one, you have to move off it and back on to get warped again. The other two issues are definitely bugs. I'll look into them.