Press z and m for editor 1 - Blocks 2 - Inside geometry 3 - Spikes 4 - 4 long blocks 5 - Special 6 - Speed Portals and more 7 - Slopes and more 8 - New Pits and more
I got the idea from Fireball_3600, I always wanted to make my own GD level. I fixed the first spaceship part where there is almost nothing in the middle of it. I added more spikes.