Yo, this is awesome! Great job keeping it simple while leaving room for added complexity and player decisions.
Combining the two mechanics of placing clocks on the grid, and counting them down to try and hit close to 0 is brilliant and very unique. One of my favourites of the jam so far, and that says a lot since reaction-time based games are usually not my thing. The different clock designs are also creative and well designed.
5/5 gameplay and presentation. Saving this one for future replays.