Helmin & Gur, Alpha 1.0

I realize that this is a school project, but I'm going to be just as thorough as I usually am. I know that you are probably aware of many issues, but I'm listing all of them in case some are new to you. Please note that I any criticism is meant to be helpful, not tear down your work.

Gameplay
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-Jumping for the big character is really jerky. It feels like my character is hitting his head on an invisible ceiling every time. Maybe some lighter gravity would be a good idea (balanced out by less jumping power).
-The big guy can get "stuck" inside a switch if he jumps on one he can't activate.
-The bird can't fall through holes that are much wider than it (level 2, just past the first switch, between the platform and the wall).
-I managed to jump onto the large gelatin block with Gur and got stuck bouncing against the ceiling, constantly making the bouncing sound.
-I really like how you're using the character dialogue to explain things. The "I'm too light for this one" statement was really good and perfectly timed.
-I was pleasantly surprised to see that the gelatin blocks couldn't get stuck against walls.
-I went to jump over the first groob and the cutscene played, then I got hit by it during that cutscene. If the player characters are frozen during cutscenes, why isn't anything else?
-I couldn't jump over that first groob without getting damaged. That's another reason for lower gravity, I would say.
-The game wouldn't let me move the large gelatin block past a certain point, even though nothing was in the way.

Graphics
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-I love the style.
-I don't like that the pixels are a different size in pretty much every sprite.
-The snowflakes often disappear too early (ex. halfway down the screen)
-I think the animation is too fast, so that it appears jerky. On a similar note, the walking animation for the main characters is actually too slow for their movement. I usually tie animation speed to horizontal speed (with a multiplier) when it comes to walking.

Audio
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-Good use of atmospheric sounds.
-The jumping sound doesn't play if I hold the jump button (Maybe it shouldn't even be a "hold" control?). It also plays during cutscenes even though my character is frozen, or if I press the button while in mid-air. I'd recommend moving the code (or drag-and-drop event thing) into the area where you actually set the vertical speed for the jump. That way it will only play when actually jumping.

Misc
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-It wasn't always clear who was talking in the initial scene. I realized later that the capitals weren't just a character yelling. Might be good to further differentiate the two characters' lines a bit more. Maybe, since it's local co-op, each character's text should appear on their own side.

I stopped shortly after getting the first part. It's not a bad game. The basic design of the is pretty good and the co-op (apart from some weird bounciness if Helmin is on Gur's head) works great. I really love the art style too.

Are you coding this or using GM's drag-and-drop functionality?