This game obviously isn't too long, it has easy to manipulate mechanics and the like so don't come into it expecting a masterpiece it is a free to play game made by 15 students after all.

The story is short but not too generic and actually has a plot and an ending.
There is only a few enemies in the game however I find them all enjoyable, from the basic rat which often turns too quick for me to back stab it to the large wolves which are much easier to take on stealthily but dangerous when confronted.
The bosses of the game aren't amazingly challenging but they are competent foes. The birds (I wanna say ravens?) can catch you off guard as you can't attack them with your normal left click and the final boss is intense as the floor you stand on could be destroyed any moment ruining your chances at getting a flawless run.
As for the achievements I feel like the 100 kills one is a bit tedious but hey it only took like 5-10 minutes of dying and killing stuff over and over, the other achievements in the game are easy to get which I found motivating to make me want to get the 0 death achievement -increasing playtime.-

I would suggest this game to anyone as its free, simple (but not too simple that its boring), quick and cures your boredom for an hour or so. So why're you reading the reviews of a free game? No harm in trying it out, GO!