Welcome!, I like the game, it runs very smoothy 
About the “good to know” tips, there are a lot of them, basic workflows, workarounds for some missings features, etc… For example, in your game, if you are on the edge of a cliff (looking at the left) there is a flickering between two animations; this could be because the animation sprites have different sizes, a common way to fix it is using a rectangle object (constant size) as the platformer, and put the animated sprite over it, the rectangle is the real platformer and the animated sprite is the displayer 
By the way, here is a great topic where Eric Matyas has shared a lot of music and sounds: [url]Sharing my Music and Sound Effects - Over 1500 Tracks]