You die. A lot.
As my two line summary states, you die alot. A whole f-ing lot. It's a fun game, but you die way too often.
No, I don't just suck. The controls don't work properly, and the fall damage is excessive.
Examples: I died right after getting the warehouse key. Why? Because I couldn't grab the latter next to the door outside. I went right through it, as I held the "W" button. I fell to the ground and died instantly.
Second example: A few tries later, I died while going down a rope that lead to no where. I mean, it lead to somewhere, but the rope just disappeared. I fell and died instantly. There was no warning of the rope just cutting out, and no way to survive that fall. Why should I give you a good review on this if I lost because of a mistake the author made in mapping out the game?
I'll give you a good review because I've seen that you've replied to a number of reviews already, not to mention that this is a very fun game. Check out what I complained about, and I'll be happy.
(Note: That disappearing-rope thing is from floor 2 -> 1 outside. There are two NPCs with guns in the room that you fall into.)