Thank you for responce!
Oh no! I thought, that I fixed all bugs with collisions! You played on fullscreen? There thermometer in UI, that not visible on page mode. If that thermometer falls to zero - you restart the level. Maybe that occur?
Yes, sound effects and music - totally agree with you! I had big plans for that aspect, but poor time management doesn't cooperate with my plans! Sounds were made in last hour before deadline. My bad. I'll be wiser next time.