You press all these cheat keys at the same moment
(might take a try or two - especially on laptops).

Result                 Code
---------------------------
Turn cheating on    -  E - G - K - U - X
God mode on         -  A - K - O - M - T
Get energy crystals -  D - H - T
Next level          -  X - V - N
Previous level      -  F - B - M
God mode off        -  D - G - J - L