2D Pixel Shooter

I want to create my first game, its going to be a 2D pixel shooter/platformer that changes the graphics depending on how many levels you have done.

If anyone knows how I do something like that?

It would help alot. Also I need help on a health meter and an inventory screen. Thanks in advance.

For the different graphics you could give each object a different frame in an animation for each level going from lowest to highest. Then, have a global variable called level (starting with 0) and whenever the graphics need to improve, you set each of the objects animation for to the variable level.

This is kinda my first game and Im a noob, when I add the behavior solid to the floor only the center in solid.

How do I fix it?

You should really check out the tutorial section ...

I got the collision polygons working.