I really liked the tutorial, the voice over was funny. I didn't understand the light flashing mechanic at first, I didn't realise the ghosts would be invisible until flashed. it might be worth casting a cone instead of a ray for the ghosts (or, if you're already doing this, a wider cone). The vacuum didn't seem very reliable, sometimes I felt I was on target and it didn't scoop them. However, it was fun finding the ghosts using the radio ping and chasing them around was entertaining too.