The way the font looks makes me think LH used Flash.
Probably (hopefully) code and not some le gaemmaker
Game Maker is just as capable of making high quality games as using "code".
Any sort of studio or engine that may "dumb things down" with the use of drag/drop conventions or built-in tools and game logic flow systems is not inferior simply because it is easier to use. Making everything harder for yourself is infact the last thing you should ever do in creating any kind of program.
Hell, even the people who use "code" I'm 99% certain are using some sort of engine, library or framework such as LOVE, SDL, Unreal, Torque, and so on. So unless you're working with binary or machine code, a game is really never made from pure code, because nobody wants to deal with that stuff.
It really comes down to preference, whether you want to have more control over how your game works internally, or if you're more of a visual thinker than a logical thinker. Using one over another, however, does not make you experienced. The only thing that may make a game creation platform inferior is its measurable and comparable technical capabilities, e.g. scripts in Scratch can only run 100 commands per second (last I checked).
