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

entries/rrootage.md

@@ -3,12 +3,10 @@
 - Home: http://www.asahi-net.or.jp/~cs8k-cyu/windows/rr_e.html, http://rrootage.sourceforge.net/, https://sourceforge.net/projects/rrootage/
 - State: beta, inactive since 2004
 - Platform: Windows, Linux
-- Keyword: game engine, smashem
+- Keyword: game engine, smashem, shooter
 - Code repository: @see-home
 - Code language: C
 - Code license: 2-clause BSD
 - Code dependency: SDL
 
-Abstract shooter.
-
 ## Building