One of the better games on the NES. It's a step up from Dream Land and is an all around good time. I do think some of the later games are better than Kirbys Adventure but this game is still worth checking out.
Pretty fun game with a good story. My only criticism is that I was not drawn into the world enough to care about actually exploring it aside from going to the main missions but those missions were pretty fun and I enjoyed the game overall.
It's definitely Super Mario World. My only issue is that the colors are washed out in this version, so I would much rather play the original SNES version.