Somebody else already recommended you Richard William's Animator's survival kit. I suggest you to look for the chapter about straight ahead, pose to pose, and the third method which is a combination of both. That, and onion skin, will be your friends for keeping proportions.

"AlanBeckerTutorials" Youtube channel has a video about the twelve principles of animation. The part about pose to pose and straight ahead will give you more insight about that.

Something else that will help you as an animator. Act what you want to animate,imagine the action well or search for a reference and measure the time. Of course, as an animator time is something you can play, so you can increase or decrease the timing when interpreting the action as you desire. Imagine yourself as a sort of actor.

Blinks can be both fast or slow. Just be sure which you want.

The frame rate is too low.

Reduce the ammount of exposition for each drawing and check your scene frame rate.
I've seen some animations pulling fluency when animating at 6 or 8 fps, but thats because the poses were very dynamic or the movement worked fine looking slow (one of those was an Oni turning into stone).

Imagine that you're animating three-dimensional shapes instead of moving lines. That will make a world of difference in whatever you animate. Unless you're animating something that looks flat on purpouse.

Fucking good timing

There's a point where the game over menu and the gameplay overlaps and you cant play.

Make sure everything refreshes to play again.

I think you should reconsider another keys to control the character, with the current ones is not comfortable trying to move, jump and shoot at the same time because changing the hands position is needed.
Perhaps having the wasd instead of the arrow keys would help, unless you're actually trying to make this shooter "impossible" in which case I recommend you to look for the game or videos about "The Unfair Platformer".

This is the best remix of the Moonlight Sonata I've heard. I love how you treated the arpegios going up and down.
This piece has some good rhythm / mood changes and that's why I chose for my last demo reel over others.

Very nice, calmed and smooth. Pretty easy to modify / edit to use as background music.

I added your music in a video presentation about what to do after some critical success, it's the final work for some course of my sister and I helped her a bit gathering the pieces.
Your music helped a lot making it more bearable adding mood and timing.
It's on youtube and the vid Id is " WdEeaLmwMII ".

For the time being, you're being credited on the video description because of time limits restrictions. The plan is adding the credit inside the video after it is evaluated (I wanted to upload it to vimeo so I could just reupload it, but it doesn't seem to work uploading stuff right now).

I'll check another of your songs. Keep up the good work.

Very entertaining to hear.
Used it here:
http:// youtu. be/SQa3HTS-AZg