Important changes

I didn't work too much since last post, but in the last 2 weeks I made some important advances.

First of all, I created working teleports! They keep your initial speed and direction at the exit. Those teleports work with rocks and the main character.

I also changed the rocks thanks to a sprite made by Miguel Herrero.

This week I made a main menu, pause menu and a working GUI. I have to fix some details, but I'd be able to upload a beta soon.