-Good sound effects
-Level selection screen
-WASD and arrow key control scheme both supported.
-The chamber rearrangement level transition effect is pretty cool.
-The red text on levels where you're over the "par" time is really useful when trying to trim your time down (and the use of blue and red makes it colorblind friendly, to boot)
-First off, HUGE issue -your autosave feature randomly broke and wiped out most of my progress. I was at level 48 when my browser crashed, and under the "par" time on all but 46 and 47. Upon reloading I was at level 18. I had to replay 30 goddamn levels in one sitting. To say that I am a bit pissed off about this would be a fairly significant understatement. I don't know what went wrong this time, as it has worked otherwise, but if there is any type of testing you can do, it would be a good idea.
-The jump key is unresponsive - I will often press it while running and fail to jump, which usually involves careening right into a shock block or off a platform.
-I often get a glitch where I will phase through a laser or block.
-I am genuinely confused by whether or not this is supposed to have background music. I do not have any despite not having clicked any mute options, but the walkthrough video seems to have some.
-Game window is kinda small
-Look, I understand that Portal basically started the "solve puzzles in a facility controlled by an evil experimenter" genre. It's natural to want to pay tribute to it. But these references just suck. Some games can pull it off, but this is no Qoosh or The Telekinetic Incident. Those games had their own storyline that justified the experiment setting, and just used occasional tongue-in-cheek references. Here, the setting is paper thing, and literally the only reason for the game to be an experiment is to make hamfisted Portal references.
-No clear function for time limit - it's just kinda there in an attempt to make the game seem more difficult. It'd work well for a bonus medal, but I don't think it adds anything as necessary to beat the game.
-GamezHero logo blocks portion of game and frequently overlaps platforms. Ask me how much fun this made test 25.
-The unnecessary flashing of the "press space to start" text is really annoying.
-While this is less important with the lack of background music, all games with sound should have a mute button unless they're sound-based games.
-Several typos in "medals" section.
This is a game with a really solid base. While it has a few definite technical glitches to work out, it's clear that you really understand the principles of level design, and your puzzles are pretty good. But the game gets bogged down by its gratuitous Portal references and unnecessary timer. Fix some bugs, take out the timer, take out the Portal references, and let the game stand on its own, and you've really got something here.