Pretty fun :)
In the start you get to customize your personal spaceship selecting what powerups you want, etc then some enemys drop powerfuls to make your weapons stronger until you get to the boss
sometimes the game is a little annoying tho because your ship only takes 1 hit to get destroyed unlike many other games where it can take 2-3 hits before your ship is destroyed and when its destroyed you have to start with no powerups all over agian