I promised myself to stick to the original concept until I had a playable game, before adding custom stuff. I couldn’t resist the idea to add a two player mode to the game though. I’m bending my own rules, but I’m still in line with the original English cover (except simultaneous gameplay instead of altering):
My aim was to release a new version a few weeks ago, but I’ve had almost no time at all to work on the project. A lot of internal stuff is rewritten, which means that some features that were available before need to be added again. I won’t release anything that miss features of earlier versions so this is stopping me. That said, I’m just 2-3 hours of work away from a new release. It will be quite a large step towards actually creating a full clone of Metroid, but it will still be obvious when you reach the end of what I have had time to do.