Thank you for playing and your positive review! I feel sorry that you couldn't experience the rest of the game because of the third obstacle, which has been causing trouble for players. The key for jumping through that obstacles should be clearer. We will definitely modify it later. Thanks again for playing!
In case you want to know our intentions of designing the third obstacle there -- We wanted to challenge players on the control and we were trying to lead players to think about the timing of jumping. To pass the third obstacle, you could jump at the moment when you are about to change from big to small. Then you will have a powerful jump and a speed fast enough to go over the obstacle (the character becomes small in the air).
Overall, this definitely needs further improved and modified since many players have troubles with this. Thanks for pointing out the problem.