Developer's perspective
Looks like a pretty bad case of developer's perspective. Most of the puzzles were more easily solved by route grinding through all possible options than by anything else. There were just too many possibilities: you may have thought that the relationship between the clues and the puzzles was apparent, but other people (like myself) didn't have that perspective. In the first puzzle, were the objects supposed to represent a saying or a quote? In the next puzzle, was I supposed to look at the first letter of every word, or maybe the second? I still don't understand how the third and fourth puzzles are meant to be solved, I got those through guessing. Even if a puzzle seems glaringly obvious to you as the designer, your players are going to interpret it differently. Was this playtested? If it wasn't, get a lot of playtesting for part 2. If it was... get more playtesters, or better ones.
As for mechanics, you should really separate the buttons for "move" and "interact." In the second puzzle, I would automatically start walking to the right when re-reading the letter, fix that. Add some kind of indicator to show when objects can be interacted with. Also, I was confused by the button in the first puzzle. Was the button supposed to mean "enter" or "input," or was the button just there to reset everything? You did a good job putting the "bzzt" sound on the button, but it still wasn't obvious enough. I thought that the door would automatically open when the combination was reached, not that I would have to set the combination then press the button. Maybe set a really easy puzzle in the beginning to show me that I'm supposed to press the button to input the answer. If you do that, you'll also have to standardize all the puzzles to be that way, since the fourth puzzle automatically opened.
The story was a bit strange and unclear, but that's what part 2 is for. No comments.
Music and art was great. That's what's giving you a 7/10. I would have rather had no speech at all instead of the weird garbling sounds people made. Either take those out or get fully fleshed out voice acting, that speech garbling doesn't work. Also an option to mute music, but really, who's going to mute that music anyway? Just throw it in, options are good.