Quick tip for the last level on hard for those aiming to get 3 stars : Equip yourself with one healing drone, 3 damage amplifiers(or 2 + 1 metal plate.) Equip yourself with the meteor cannon(Upgrade to the max) and the most expensive spaceship. If you don't have any bomb left when you get to the final boss,then just destroy his right side.After this, take cover on his right and wait for the healing drone to heal you a bit. Then just attack it on the right and dodge upward right. Do it repeatedly till it gets destroyed. When you are on its upward right,the boss can't do any massive damage to your spaceship(just dodge the few 'bullets' it throws your way).
139 months ago
If you don't have any bomb left when you get to the final boss,then just destroy his right side.After this, take cover on his right and wait for the healing drone to heal you a bit. Then just attack it on the right and dodge upward right. Do it repeatedly till it gets destroyed. When you are on its upward right,the boss can't do any massive damage to your spaceship(just dodge the few 'bullets' it throws your way).