First jump - Top floor --> Works fine :)
I'm sorry, this game just falls flat. It seems like a cool idea but trying to play it is more frustrating then anything. I fail the first big jump more often then not (when I do succeed it's only just), I have no clue how to kill the monster or how to escape it and the first part with the three ledges before the jump is way to long making it even more annoying when I have to restart. I feel like the game needed a few more test runs before you posted it here. Neat idea but the execution needs work.
Here's somethings to consider.
Try shortening the first jump, put some money or shorten the opening run before the jump, and give more detailed descriptions on how to kill monster then "fire at will". I shot at it, but it didn't seem to do anything.
Maybe gold should be added so you can actually buy the offered upgrades?