Nice! I like the graphics and audio. Looks polished :D My only concern is that the objects are not always saying explicitly what they are. Like this "deltoid" that kills you on touch - I thought that it is collectable. Or some blocks look like collectable but they are just platforms.
In my game, I wanted to take the "3... 2.. 1." in the same way as you (jump after the countdown) but in the end I used it as a power indicator. It's always great to see that different developers could make different games based on the similar concept :)
Good job!