Hey, thanks a lot! :) you have no idea how much it is relieving when people get that aha moment in your game, it's so similar to how GMTK explained that in his video.
Those dilemmas are the thing that makes puzzle games fun, and as a developer, to make a cool mechanic twist that is clear enough that players will understand and challenging enough so that players will not find the solution immediately is the best part about making a puzzle game!
So as for your suggestions, I'll not lie, we couldn't find any song to fit the game, we've tried making some tunes but it had to be atmospheric and not melodic at all, because everything with a melody would just ruin the whole dark and mysterious vibe of the game, we were aiming for something like the Hyper Light Drifter OST, but the sounds there are so hard to create, we'll definitely add background music when we'll update the game, because we're planning to continue it (probably after ludum dare 50)
Wires would've worked with the puzzles, if it was only easy to implement a system like portal that auto-connects buttons and doors easily, I think we'll end up using tile-maps or something for that to show a line between the door and the activators
As for the controls, dumb mistake by us, you can use the arrow keys to move, I don't know if you knew that, out of habit we just wrote WASD even though while testing we've used the arrow keys, this is why we added the screenshot in the home page, but I guess it was too late
Also I agree, this concept has a lot of potential, our ideas include making a second bench that will swap you and your clone, making a clone variant of you that has different abilities, or pausing time when you're resting with your clone or something, the last one is the most promising I'll not lie
Super happy to read your review, really, we'll make something with this game, boss fights and more mechanics are coming, every comment just drives us more and more to continue this game and finish it properly
Also congrats for the 8th place, you totally deserve that!