Indeed, I do believe they have good plans for a mainline Metroid eventually.
Ah, well, one of your Metroid levels felt like it. :s Maybe I just missed something obvious, hah. I shall try again once I boot the game up again. ^^
Oh, and you are very welcome. ^^ I've put hours into my levels as well, so, do feel free to check those out when/if you want, of course. XD You can find a recent one in the Mario Maker thread on here, and while that one is not really a super one (it is a short, simple one I made because I discovered a silly thing when I made it), but some of my other ones are good in my opinion (have over 1500 stars, so, people agree!). So, try sometime! XD