May 29th, 1985. It came out, and everyone was astonished.
Monadius is to congratulate the 20th anniversary of Gradius, and is to thank for the highly developed history of games and programming environments since then.
Monadius is a shoot 'em up with the selection bar power-up system for Windows.
It also is one of few :'( games written in Haskell, a purely functional programming language.
Well, it's another Gradius clone. To be rather more precise;
Monadius is a freeware distributed under GPL license.
You need Windows with OpenGL installed to play Monadius. Or you may need to compile it.