I really liked the "display" at the end!
It took me a couple of days (unlike some people I couldn't just sit here and play solidly for hours!) but I finished it. Was tough, but never too frustrating.
One of the charms of the game was the mix of puzzle-solving and precision control (especially at the end), but I think this was maybe also its weakness. I know other people have said it but towards the end it did get to be a bit too much like "If I move a fraction too far I'm dead"
Saying that I really enjoyed the challenge of avoiding fire on the later levels (lvl 29 and 30 especially).
I'm sure you know what could be improved, I guess a few more items, more enemies, larger arenas?
But definately overall a stunning game. I wouldn't even know where to start! Don't let people get you down just because they can't beat it, it's obviously possible, and you don't need to be a gaming pro or anything! Though I reckon my degree in Physics helped!