Speedrun mode! & small changes to mechanics

To make it easier to see where the platforms go I add a line from start to end point

To make it easier to know when the lasers will start I add an animation that plays just before the lasers start.

I also made a speedrun mode with a counter. The speedrun mode only has all the platform levels. 

This is an experiment I still don’t know if it is a good idea. Let me know what you think.