@ChronoNomad
I was able to get up this impassable rise you speak of. I am not sure what happened with your game, but I am far into it.
As with the fast enemy attack patterns, that's simply a good amount of difficulty. It's supposed to be hard.
This game, for me, is very enjoyable, but I did see a minor bug in the first boss level. At the part with the 2 bats, the descending elevator, and a green and a red cyclops, I think the green cyclops got stuck in the cliff as I was running from it. I believe it got caught between the elevator and the cliff.
But it was a very minor bug, and is not very prevalent. Overall, this is a challenging, fast-paced thrill ride of a game. Very well crafted.