Got it. Thanks for feedback. I am starting to think that the first level was more challenging than necessary, should have eased the players into all the challenges. Also, I'm no artist, so it was very challenging to get the lighting right and the mood that I was going for for the outside area. I wanted a bit of fog, mystery, red menacing mist etc. Maybe it didn't quite work. It does help when you play the game in a darker setting around you though...
Wonkiness when jumping... not sure what that might be. It may have to be game's performance, maybe the way it's done it takes up a lot of unnecessary resources? I will have to improve it. A friend was saying that on a weaker PC it was a bit slow which made it difficult. But I'm assuming you tried it on a decent spec computer if you are a developer yourself!
Thanks again for playing and giving feedback. Much appreciated