Finally, a game I can play without high APM! This is a super fun puzzle and the rapid thinking makes great engagement. I would personally prefer a visual timer (like a decreasing bar or arc) for when I'm panic checking the time, but the UI is great otherwise. Love the neon sign changes as I progressed!
I think you have some logic bugs when replaying. I noticed after messing up this run that when I tried to start over with difficulty 1 (that's what the 1-25 should do, right?) the board was exactly the same as when I left it having just failed. This was consistent throughout. Other than that, the play is super fun.
The music is a good match for the short play session, but the loop could be a bit longer (don't worry, I didn't get to sound at all, so something is better than nothing).