Thank you!
You are totally right, that (in my words) the first and yet only demo level is actually pretty bad. It's too hard and does not take advantage of the different gameplay elements (slow/fast/jump fields and quantum-jump). The main reason is, that I have added slow/fast/quantum-jump on the last day before the jam end and then I had no time to build a good first level that uses these elements wisely. It's a shame.
After judging is over, I plan to improve the situation by adding multiple levels that introduce progressively more gameplay elements and raise difficulty slowly.
In regard to the voice overs you are right too. They can really get annoying. But after finding out that Ubuntu comes with a speech generation library (like my old Amiga 500), that sounds actually also a bit like my old Amiga 500, I couldn't resist to go a bit overboard with it :-)