Thanks for playing the demo!
- About obstacles, the main way to recognise them is that they're always black and have a long shadow - these might not appear if your graphic settings are set to below Medium, so we recommend setting them above that. Ultra should be fine, as in theory the game does not require too much to run well.
- You should be able to see the ammount of lives left on top of your boomerang when you hit an obstacle; was it not there for some reason?