Good game. Overall, it's a good idea, but could have a few more fetures.
1. Time bounses. Spawn every 5 seconds for 1.5 seconds. If clicked, +10 seconds.
2. Decay. After 10 seconds, clocks decay. this stops mass buildup, and makes for a more balenced game
It does look good, and feels ok, all in all 7.5/10