Puzzles were good as this is a great idea for the theme but the platforming part could be improved as the player had friction and didn't feel fluid.
One little thing with the webgl build that the screen cuts the levels if not in the fullscreen mode as I have realized that on the second level.

Oh man, clever use of death in that first puzzle and solid way to teach me that death is necessary to progress. Well done! I would make sure to lock the aspect ratio programmatically (or design around multiple ratios) as the spike in the first level was cut off until I threw this in full screen mode. Cute sprite and the film grain gave it an interesting analog vibe. Your level design reminds me a little bit of Portal with the repeating pattern but with a twist. I would've enjoyed a little more variety in the layouts however.

Here's to continually learning and growing!