descriptions of entries checked and either incorporated to keywords and inspirations or redundancies removed

entries/pixel_wheels.md

@@ -3,15 +3,13 @@
 - Home: https://agateau.com/projects/pixelwheels/
 - State: beta
 - Platform: Windows, Linux, macOS, Android
-- Keyword: game engine, open content, racing
+- Keyword: game engine, open content, racing, 2D, top-down
 - Code repository: https://github.com/agateau/pixelwheels.git
 - Code language: Java
 - Code license: GPL-3.0
 - Assets license: CC-BY-SA-4.0
 - Developer: Aurélien Gâteau
 
-2D top-down racing game.
-
 ## Building
 
 - Build system: Gradle