Wow this is great! This game deserves more plays and ratings! It really reminds me of super mario bros 3 in terms of movement and looks! I though it was a very interesting and fun choice to have the coins you collect also be your health (although maybe they should've been hearts or something instead of coins just so that it's clear)
I think one of my biggest points of feedback is to include some kind of checkpoint system. It was a bit of a bummer to get far and then fall down and die instantly only to have to replay the level again, but other than that I was having a blast! Well done!