Hey burning apparatus if WASD is to hard to use with g then you can use the arrow keys with g or WASD with shift. And level 5, is a pretty tricky level where you have to use the light of the character to find the portal, p.s it's in the second door, just place the platform well and jump you'll be able to get on it then fall into the second door, hope this helps and thank you for playing my game if you feel I should expand on it please let me know.
Once again arigato(Japanese for thanks)