I can't go anywhere except from where the ship landed and either sides of the main entrance.

Please help!

A walkthrough or just a tip would be great

Okay, first, go to the left and right of the ship and stand on the buttons, to make an elevator rise up. Blow up the two boxes before you go down on the elevator, and make sure you blow up every last box. 4 guards will come into the room, so defeat them, I recommend using Gravity Bombs, if you dont want whatever they leave behind. Once they are all defeated, the door will open, so go back up the elevator and go through. In the next room, 3 more of those guards are there, so take care of them to unlock the doors. Take note of the 3 devices in the center of the room. Go to the right room first. You should notice a low bridge blocking your way to the other half of the room when you enter. However, the bridge isnt quite touching the ground, so you can kick bombs under it. Youll notice a switch in the top-right corner, so kick a bomb under the bridge to it, and that will lower the bridge and the nearby ladder. Now, just take care of the enemies if you didnt already do so, and Key Card 1 will appear. Go back to the previous room once you get the Key Card. Go to the opposite side of the room and put your Key Card in that device. Continue to the next room. Just ignore the enemies here and go through the bottom door. Here you have to bomb the mechanisms at the sides of the barriers to continue. Be quick though, because they spawn back. Defeat the robot at the bottom part of the room to unlock the door. In this room, Take out all of the enemies first, then place bombs by the switches on the left and right parts of the room to make to devices appear. Bomb them until a large object comes out of the floor, then bomb them again to destroy it. Go through the door opposite to the one you came in. In this room, defeat the enemies. I like using Gravity Bombs as they get the job done, unless you miss of course.
Continue down the conveyor belt being careful not to run in to anything, and procede to the next room, which is the bridge room again. Procede to the left until you arrive at the room where I told you not to deal with the enemies(Theres a ladder right next to the door). Climb the ladder, kill the guard in your way, and procede to the next room. Defeat the enemies in here. Again, I prefer to use Gravity Bombs. Go through the left door. In this room, go to the right of the room, and kick an Earth Bomb at the mech(Note: If your Fire is max, it will destroy the mech and the guard). Kick another Earth Bomb down that path to defeat another mech and hopefully, the other guard there. When they are defeated, you will hear a chime. Procede down the path to find Key Card 2! Now, trek all the way back to the room where you inserted the first Key Card. Put Key Card 2 in the device opposite to the door you came in. Now that youve seen the door that has been opened, procede to the right, to the bridge room. Defeat or dodge the enemies in this room and climb the northern ladder, then go through the door on the right. In this room, climb up the ladder, but as soon as you are off the ladder, stop. Youll notice 2 mechs, and they can give you quite a hard time, unless you have Remote Bombs or the Guardian Helmet. If so, do this: As soon as you climbed to the top of the ladder and got off of it, kick an Earth Bomb down and detonate it right when its at around the middle of their body, and it should take them both out, and the guards, too.
Okay, well, thats all I got so far. I still have to figure out what to do next, so I hope this helped.
Good luck.