Wow this was great! Moving felt really crisp and I was impressed with how tight everything felt. The only thing that might have made an improvement was resetting health on death and doing a small period of invincibility after getting hit; I found myself not being able to get off long stretches of spikes in time, and sometimes I'd be down to half a heart with not enough skill to get passed the more armoured enemies and not die again. Balancing needs a little fixing too, otherwise great job, it's a neat little game.