And that's the name of the game: this character is affected by realistic physics, so if he runs into an object, he'll probably lose his balance and fall. If he falls more than three times, you'll have to restart the level.
In addition to these physics, across the different levels you'll have to fight enemies who try to knock you over, while overcoming tricky jumps, spikes, boxes, and all kinds of dangerous elements.
Fall Over! is a very funny game. If you like platformers, you'll probably enjoy it.