I thought the game was very good. reminded me of Cave Story in the way it feels and the music.
the only thing i didn't like was the controls for the hammer ground pound. It was confusing at first if i would jump then press down but eventually figured out you have to hold jump and down at the same time in the air which take some getting used to. I would switch it to just press down in the air to ground pound but that's just my opinion.
aside from that and the game being in alpha i think its coming along very well!