Platform : on computer, with french links like « Jeux.fr » or « jeux gratuits.com »
When : I played it probably some years ago, around 2005-2010
What : it was a defense game where i think you could play orcs. The goal was to destroy your opposent’s castlel. I think you could make spawn a hero, you’re opposent too. The orcs where like dark, like a shadow form on a green screen, which was probably the countryside. I’m sure about the fact that one of your troops was a (giant) spider rider (in my memory the rider was blue, but not sure). In my memory there was a little platform just before your opponent castle.
Excuse my english, and thanks for the help