This amazing art, nice game, are you working on GAMEMAKER?
and do you want to sell your template.. for metroid vania games.
Thanks and yes, I use GameMaker Studio 1.4.
This is not really suitable for being used as a template, there are way too many project specific parts.
So this will most likely not be sold as any kind of template, sorry.
I will be selling the actual game when it's done though.