This has really great potential!
Not sure if it's my computer or it's an intended mechanic but the light was too slow to control. In the Normal Mode, I managed to scare away a few cockroaches but there was no indicator to let me know what I needed to do to go to the next level (e.g. scared away a number of cockroaches or kept the biscuit safe for a period of time)
I tried the Infinite Mode, but only lasted no more than 15 seconds. Man, those bugs are sneaky.
It might also be helpful to show where the cookies are at the beginning. I couldn't determine which areas I had to protect from the bugs.
But man.. You made this all by yourself. That's awesome! Keep up the good work :D