i was alt level 4 where u had to evade the flying thingies and then suddenly my game crashed, and all my progress was lost. Saving was not a problem before, i didnt play to level 4 on one run, but now i have to resart.

Any way i can use a debug menu or cheat terminal to go back to level 4?

Type backdoor in the main menu and it will unlock the backdoor level. Before you do though I suggest you reset data to make sure nothing was broken.