A bit of fun, and catchy music, which is important for this genre. Simple game as it stands right now, but I assume you're going to include upgrades or something to spend gold on which will be good. I think once there are upgrades and more/diverse enemies this could be a fun sidescroller for mobile - I'm thinking rankings/leaderboards would benefit that as well if you're going in that direction!

Pretty basic concept.  You could have at least given us a title screen and a death handler.  

I can't vote this one very highly since it doesn't look like it has much potential or hook in and of itself, but I like the visual style.  That said, the controls feel unresponsive, which is really bad in this genre. I couldn't tell how to convince the knight to go precisely where I wanted. If you continue work on this or re-use the code, I would suggest fixing the feel of the movement early, perhaps by tweaking the knight's inertia.