Mrhh, its not bad! It starts off... very lacking and with a poor basis. Afterward, it really picks up, and has some nice speed and walking on walls sections that remind me of sanic. I died 3 times trying to get past the first fire bro, (they aren't vanilla, so I don't know their pattern, if any
) and I got screwed over by noteblocks in quite a few sections.
This bonus section is rather empty, (you can't tell that there are coins up there, so chances are you're just going to use the coin trail as a bonus) as well as some other parts of the level, but since this level is a rather speedy quick one, I don't think that it really... matters. The bonus section should probably act more like a bonus section, instead of just giving you a few coins. Also, this really doesn't feel like a bonus section. It is poorly placed, to go along with that. It probably shouldn't be at the beginning, and it should probably be more secretive. It's more like an "optional easy path" at the moment. This is my biggest issue with the level, and I also agree with everything large crawlyworm said, and what Noivern said, but don't really feel to duplicate that
Why not just have one noteblock here? It'd make it a lot easier, and the coin placement would make a lot more sense, considering how pointless it is to have three under the one.
This would be a lot better of a place to hide a bonus staircase (you know, vine or whatnot, door), considering it actually does take a bit of doing to get up there. (Not really, but if you miss once, you can't try again)
Pretty good level in all, just has a few oddities with placement that make it feel a bit poorly built.
I mean, it's twenty times better than that gong show that yoshiatom made
I probably don't need to say "fix", because everyone else already said that.