Thank you for helping me! I solved this problem.
But I got another problem with the sprite animation. I made a new video, so maybe you can help me out.
You can see I have two different enemys(in black) one is moving pretty fast, but his animation is just fine. The other one is a bit slower but his animation is kind stuck. I imagine when I reduce the max speed, acceleration and deceleration I have to make some calculation to also reduce the frame speed, but I don't know how. I tried many different combinations and the enemy still kind stuck.
Edit: If you prefer, I uploaded the game here: almeidamarcell.com/indiegames/cesupa-game/index.html
On this video I 'played' the game twice because I was also testing an collision problem. But I created an different thread for that! (http://www.scirra.com/forum/topic65756_post403436.html#403436)
Here is an screenshot of how I setup my enemy animations. i.imgur.com/TkRelO4
He is not black on the screenshot because I used blend to make his black on the game, the sprite is the same as the player.
Thanks in advance again! <img src="smileys/smiley32.gif" border="0" align="middle" />