absolutely do not pay full price for this game, i rate it at between 7 cents and 25 cents in value.
this would get a meh to ok'ish on a free flash game site.
no saves, only checkpoints are the start of each level
only 10 relatively short levels, i wouldn't be surprised if a speed runner could do the whole game in 10-15 minutes.
most of your game time will be redoing levels trying to get the rythm of it.
as long as you are not spotted, camera'ed, and don't kill anyone you have infinite time, otherwise a 2 min countdown starts after which guards with cheat sight are sent after you. this is a non-issue for many of the levels since they are less than 2 minutes if things go well.
there is no real inventory except changing clothes if you find some or from a dead body, which cuts guard sight range in half, ie you can't look at a document other then when you pick it up
in some places there can be trouble telling between wall and non-wall art, also when first starting it take a while to get used to wall v glass wall. level score doesn't affect anything so don't worry about it.
the guards have something shotgun like but you will never wield a gun in game, just a near point blank melee kill.
there is no hacking minigame, just walk up to a terminal, hold a button to hack, press another button to login, click the checklist of cameras and door locks, and logout. some doors and cameras are not linked to a computer and therefore are not hackable.
no cutscenes or special ending, just level intro text, text when you pick up some evedence, and a very few npc dialogues.
i'm writing this 2014/11/15, the game may change in the future.