A fine game to kill about 15 minutes or so. :)
Interesting concept, with getting to the being to get the goal but a move counter is forcing you to think more cautiously about your steps. Game starts off with easy tutorial levels, then gets a bit more complicated, however, towards the end you relied a little too heavily on the 'shoot a skeleton while it's right beside you' gimmick that the game pretty much turned into only doing that in order to progress.
Larger levels with more possible paths to take and perhaps different colored keys to release different groups of skeletons would bring back the strategy element of the game and get back on track to your 'flight or flight' to save moves mechanics.
Tile based movement seems to read just fine, but the character movement is perhaps a little bit too slow for people playing the game more than once. You could have the character move at the speed they do now if the directional button is clicked once, and is sped up if the player keeps pressing the button, just to make the game faster if a player was trying to get back to a certain level.
Aside from that, a bit more polish and maybe some cutscenes or an intro would be a nice touch. 'Why' does the player only have so many steps per floor? Why are they exploring in there? Why are unsolicited skeleton smooches so undeniably lethal? Inquiring minds wanna know. :P
A couple more songs to choose from would also be a nice touch for people playing the game for a little bit longer than most...
And lastly, the game has no 'Play Again?' button after it's beaten. So I had to exit the page and come back in order to replay it after I beat it. Just little improvements like this would be nice and helpful.
Good start, but there is always room for improvement. Keep it up!