Great game.
If you like Xevious, you'll probably like this game.
It uses a similar shoot and bomb system, but with a catch. your bombs are intended for destroying the interlocks that hold a layer of a station together. Once you've destroyed all of the interlocks, that layer of the station falls away to reveal a layer below it. As you descend, you make your way to the core. All of this makes for interesting viewing as the layers slide past each other using parallax scrolling.
Although this is available for a variety of home systems (lke the MSX), I'd recommend starting with the arcade version first.
This game was pretty much unknown in North America and is only now gaining some level of familiarity with retro video game enthusiasts.