There's a wide pool of them and it's near to damn impossible for me amongst the 72 levels (74 outside of the 4 SGC videos) I've played. But I tried, and I don't even know if I wanna call this accurate.

No number 1 though, cause I think almost everyone here knows what that is for me, and I just wanna highlight some of the other entries.

2. Space I Guess

3. Kisaragi

4. Kami

5. HideOut

6. Mission S (The one by TwanDash and Co, not the other one)

7. Out of Place

8. Echo Delta

9. Abducted

10. Cosmic Crush

Honorable mentions: Point of View, Kiss of Fortune, Starmalade, 102 Blues, Stellarnova