You added music which is nice. You also put work into the page. Sadly I could not wrap my head around the controlls. The fact that you are required to use the mouse, arrows and space makes it hard to be efficient : P
Viewing post in Into the swarm jam comments
The arrows were supposed to be WASD originally, but unfortunately, something particularly strange happened during the last tests that HTML5 decided to completely turn off the W hours before the deadline and no matter what I did, it did not help anything, but what makes it weirder is that the same code falls on The arrows and it worked great (it's just one simple sentence), so I had to turn off the WASD completely. I have no choice and it pretty much ruined the game. In retrospect, this may not be the best idea.