Really neat game, it's quite challenging, but the mechanics give real satisfaction when figure something out, I like it, even though I couldn't beat the final boss..
Changing direction on jump is quite creative, certainly it took a bit of getting used to but I thought the dimension it adds is actually quite cool.
If there was anything I'd change it'd be maybe to make the bosses healthbar larger and add some sort of effect when he take damage, I wasn't sure when I was playing if anything I did was actually working.
Would love to see an expanded version with more levels!