Didn't read White Rabbit's report, so there may be some repeats.
Mask the level sides. Particularly the one on the left - ammo can get stuck, and people can hide and be invincible to bullets.
Make the sucker tube on the left a little easier to enter.
The secret passage on the bottom probably shouldn't have three arrows on each side, as that just looks annoying.
Having only ice in that secret seems rather pointless.
The warps on the right could use the glowing yellow star animation, and just one arrow, rather than all four. Having all four is confusing, especially when one doesn't even point to the tile.
The snow looks good when you're standing still, but the two layers use very different X speeds, which looked strange whenever I moved around.
Why is the snow falling straight down? Is there no wind at all?
The eyecandy is pretty good, but it felt like it could use one more color. Red would work. There's a lot of red in the tileset.
Final... the level's name is "Noel's Gift". Ok. Where's the gift? There's hardly any ammo, let alone anything special.
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