Great game, I made it to level 6. Most levels did have quiet a learning curve to figure out how get past certain parts. In level 6 you have to jump really close to the first spikes inorder to make the jump and in is nearly impossible to get the knight to turn around after you collect the first gem (so when you collect the jump, go back down and need to turn around because you can't make the jump over the lava and spikes).
Yes thank you, I did manage to complete all the levels. Level 9 was much harder than level 10 though, because of the timing of the first dragon. I also found that you can't walk over the dirt wall next to the exit door (level 9) and it did seem like there was a really small deviation in timing between the creaters whenever you restart. In addition to the knight sometimes getting stuck for a few second when hitting the large dirt block in level 7 (when changing direction before going to the platform with the snake at the beginning).