This is actually quite a nice game. Needs a lot of work, but the work would be simple work. Fix some of the out-of-place blocks. I'm not sure about music or sound effects, I played with the sound off. It doesn't matter about graphics, because really, the non-moving blocks graphics are great, and you can easily see the door and the character. People are right with the "need more challenge to it". But you could make some levels that you need to do wall jumps. Or pickups that you can get to unlock bonus levels, or just have them for points. Add difficulty levels, easy being unlimited lives and no time limit, hard being 10 lives or so and small time limit, medium in between. Put in hard levels, unlocked when you complete easy mode. And when you complete the hard levels you unlock a mode where you have to dodge flying things and has a leader board so people will play it. This version, I give 2/5. Do some of those things, you could get at least a 3.80, but i would give a 4.50.
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Making a game 16-bit would require A LOT more pixelart skill. I think you see the problem.