Hi people, still missing some things, it's something like "Luigi's sprite editor" according to the style.
Keyboard shorcuts:
For frames:
Ctrl + Right/Left arrow = change frame
Ctrl + F = First frame
Ctrl + L = Last frame
Ctrl + A = Add frame
Ctrl + D = Delete frame
Ctrl + C = Copy previous frame
For IO (the classics):
Ctrl + O = Open
Ctrl + S = Save
Ctrl + N = N
E + lclick = eraser
Others:
P = Play/stop animation
M = change Playing Mode
C = change Color palette
G = show/hide Grid
(and some intuitive ctrls over there)
Some pics:
Editing:
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Create new:
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Open:
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.love: https://mega.co.nz/#!Nh50gZCA!Ipc5kX_H7 ... NI9cz9tU2k
Have fun with this tool:

With
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Remember, the program isn't finished yet, have fun

EDIT2: the '*' indicates a not-saved animation, for the moment, if you want to see on playing what you drew, save first.
EDIT3: I'll be updating an stable .love file every 4 or 5 days on the same link.