It was entertaining...
...but a few things were very annoying. The first one is the music. It's not really even music, it's an annoying 5 second loop with no real melody just the same note pattern going up and down over and over again with a bass drum. Something even worse than the music, the inability to disable it.
Another thing was that the eraser and the bugs didn't always seem to hit properly. I understand you probably made the detection as small as possible to avoid people just running over something and finding a bug without seeing it, but when its clearly in the open and you have to mouse over it 5 times to get it, that's annoying as well.
Other than that not too bad, obviously more content or some more interesting art would improve the game as well, as well as fixing the music.