In case someone needs it, here are some cheat-codes for the game:

In the Magrunner\YoshiGame\Config folder open DefaultInput.ini with Notepad
In the section
; Game Keyboard/Mouse Bindings ; Primary default bindings
add these bindings to the other key bindings there.

.Bindings=(Name="Z",Command="Fly")
.Bindings=(Name="X",Command="Ghost")
.Bindings=(Name="H",Command="Walk")
.Bindings=(Name="P",Command="PlayersOnly")
.Bindings=(Name="Y",Command="KillPawns")

When playing game use these key functions:

Press z for flymode
Press x for noclip mode
Press h to stop flymode or noclip mode
Toggle p on/off to stop everything on screen but player
Press y to kill all enemies(turrets etc,)

Oh I see you're from Hungary as well.

Do these keys match the Hungarian keyboard? (especially the Y and Z ones, since they are mostly reversed in some games)

And for even more help, levels 1-39 video walkthrough by Pen15Gaming:
http://www.youtube.com/playlist?list=PLaAZILgFEUxI3J9dI4qHBR-BAB9VIgaRq

I'm sorry, I don't know, I have US International keyboard on my laptop. The z and y buttons are replacing each other on the HUN keyboard, so use it that way.

<3 you. I was near the end of the game, but I had to stop because of some very precise reflex platform juggling thing. I dunno if I'm getting old or what, but I could not get the timing right.