Cool stuff.

One thing I have mentioned in another submission, as an advice for the future, is to try and make it so you can use WASD as well as the arrow keys. It has no downside most of the time and it has some benefits like being more comfortable for some and easier for some users to get used to the controls since a lot of popular PC games also use it (also in my small keyboard I have to press "fn" to use the arrow keys, which is annoying xD).

A very promising game concept. I think if you continue to develop the project, it will become popular. Some of the levels are really thought provoking, and with the mechanics you've implemented, you can come up with a huge number of very interesting levels. Good job)

I had fun but there were a couple times I had to restart a level. It's a good thing you added a level select menu and way to restart.

Pretty good! Reminds me of some of the old Flash-based puzzle games.

The box was kind of janky: sometimes it would get stuck in the middle, and in the first puzzle it can get stuck on the right player’s head. Maybe for the first issue you could make the beam in the middle push the box out when the box crosses it, and for the second issue you could add platforms the player can walk into to push the box off.

I would have liked to see the window mechanic used more, to fit the limitation better.

The puzzles were fun. I only find the control scheme a little confusing. I kept confusing space, up, and down.