This is pretty cool dude! The artstyle, story, and the game play fits well together. Level design wise, it's pretty well thought out. A good combination of switches and doors, things to collect and the encounters with the enemies are balanced enough not to be too easy or too difficult, although giving life points seems to be happening every now and then - I'm getting more lives than what I need on a level.
One more thing I noticed is the lag on certain points, it might just be my laptop since it's too old. It lags on some point where I think some sort of loading of the environment happens or a mob of enemies are spawned but nonetheless it's not too game breaking but lag isn't appreciated. :)
All in all it's I'd say its a 4.5 stars. Keep it up. It's nice to see games like this that's pretty well polished since I myself is just starting up to be able to polish my games.