Still needs some work..
First of all, the music loop is very irritating, also, try giving some space at the top to avoid the monsters, I kept going to the next level when I was trying to avoid the monster to get the last bit of gold. Other than that, it's a fair game. One last suggestion though, Change up the sprites a bit and perhaps even add a new level of depth to it (ie: lava pits, flying monsters, flying buff, etc.)