Hey! Thank you very much for trying the game out! To be honest, I only just tried the “tileset” I was using for level design to make stairs maybe a couple hours before I had to submit the game. The navigation mesh looked to support stairs, and in my limited tests, the enemies did seem to use them… though, to be fair, I think I only tested them chasing me DOWN the stairs, now that I think of it.
As for dying… that might not be a freeze. It was never made clear in game, but the player has no “death” animation. All movement is just stopped. However, pressing the space bar SHOULD free you up again with a new attack (there’s no visual change except for the attack animation).
In any case, I thank you very much for trying out my game!! :)