Well not exactly the same. They are handcrafted.
(well its easy to do, the textures are quite simple)

Its maninly about the idea to use a pool of neutral assets.

Some small recent games of mine:
Griefer 4k http://damocles11.byethost9.com/griefer4k.html
Kobold 4k http://damocles11.byethost9.com/kobold.html
Cave 4k http://damocles11.byethost9.com/cave4k.html