This game was packaged with the US SegaCD. It can be quite repetative as your flying in the same ole tunnels and killing the same things throughout the game.
Its a fairly easy game, Just follow the directions and kill as many tunnel rats as you can. (Not enough points is a game over and letting to many rats through eats ship energy) Only troubles start when the kamakazi robots take you by suprise when taking a tight corner. an annoyance can be that you miss a recharge point as you can easil miss it as it appears about 1 second after youve been notified.
I wonder if the game was a system seller and after playing it you know you made the right choice of buying the console ;)