Basic Obstacle

This was my first game in Unity to create a game level of an obstacle course, there are bugs and collation events off a few pixels and it won't be updated, but I am so pleased with the turnout for my first go. 

I believe there is a collision buffer error, so it responds even though it isn't touched as the buffer is bigger than the item. 

and it going though the walls at the corners I have no idea how that happened? 

To move the player uses the Arrow Keys.