Thank you all very much! And yes, those models are of course only placeholders, probably for quite some time because character design + animation is not my favourite aspect in game development.
Btw. I've decided to vamp up the difficulty a little as it makes room for more interesting jumps, platforms and obstacles. Sadly I am not able to balance the levels so that the difficulty increases consistently, that means sometimes after a hard level follows an easier map but I guess/ hope that's ok?