There's at least two stages (as far as I got) and while the first boss is rather irritating (He's invulnerable for much of the fight) the second one is really neat. The main problem with the game is that it has speed issues... in that, game speed does not adjust correctly with the CPU. I ran it on 8 Mhz in T98-Next and it lagged considerably with lots of projectiles on the screen... but 16 Mhz was clearly too fast. You only get three lives, although you can continue from the beginning of the stage if you're at the 2nd stage or beyond. The corridor flying is very hectic and adds a lot of difficulty to the game.