1-1: It's not really that consistent. It works fine as a 1-1 until you get to the sublevel, which is suddenly closer to late-game difficulty. There are several sprites that you only use once each; you really need to pick one or two and focus on the use of those. I also don't like how you handled the last coin, with the activator instead of requiring a mushroom.

1-3: I really liked the beginning of the level with the mushrooms and I'm a bit disappointed that you didn't develop that as the level went on. I don't agree with the use of hammer bros so early in the game, but that's just me. The ground and decoration are varied and look good.

1-4: Not too fond of that P-switch sublevel. The placement of the coins could lead the player to believe the coins on the bottom would turn to bricks when the timer runs out and block the exit. You should find a way to distinguish ledges you can walk through and those you can't, as I thought the ledge at 0:45 was solid at first. I also believe you should introduce the bob-ombs in pipes earlier in the level and use it a couple more times.


All three levels are a bit sparse sprite-wise, but that's okay because they're early world 1 levels. Also the zoom out at the end near the flagpole is a very nice touch.

By that, I meant ground-pounding the bricks directly above the coin. The video implies that's not possible.

Nothing is necessarily bad design. It all depends on how you use it.

"Fake" brick blocks are perfectly fine if you provide another noticeable way to get through, like in the picture that was just posted.