This was a nice little puzzle game, but the mechanics were often a bit unclear to me. The H button helped a lot, but even then there were some levels where I got stuck. Often I still missed or misunderstood an important game mechanic (for example, I thought that after the timer ended the whole level would reset, but apparently buttons you pressed stayed turned on). That being said, I think many of the puzzles were quite clever and well designed!
You mentioned this was the first gamejam game you uploaded, so with that in mind I think you did an amazing job! Congratulations on publishing something :D I also really liked the minimalist artstyle you used. It is simple, but it is beautifully cohesive. I hope the feedback does not get you too demotivated and that it can help you improve for next time :)