Interesting but very hard. I was not able to overcome the 4th obstacle. Air controll is very hard. I have read that when you make a game jam as you play the game so much for test you are better than the average player so don't hesiate to reduce a bit difficulty. At least let players overcome the first screen so they will see more variety of your game and get more engaged. Me i give up on the first screen of the game after one hour of trial.