Custom / Concept, by 
It doesn’t suck (liking the eyecandy a bit), but i give you tips for your next groundforces/levels:
Don’t make platforms, place the tiles, where you play, very randomly, not like platforms.
You didn’t used all tiles at Layer 4, if you don’t understand it: The size from your layer 4 is too large! You didn’t used all the tiles. Make the layer’s size a bit smaller
(look at the status bar (down right), there you see 2 numbers (like 231,385), they are the position of the selected tile.) and it is better
(i hope you know how to resize the layer 4, if no: go to layer 4, click the button, which you clicked at layer 8 (for the textured background) too, type the size in the Textfields and apply).
The ammo placement isn’t VERY good, you made that platform with the NOT generating powers, fastfires and clocks, but WHY. Please erase them, then is the ammo placement good (too much ammo at the places where you find them)!
That’s all what i found. ~RedMser