Im Impressed
It took a while but I finally completed all 21 levels haha 19 is by far the hardest, although i couldnt kill all the guards with the chain explosion, i had to snap one guys neck because the explosion had only destroyed one of the crates surrounding him.
Good points: Great graphics, great engine, decent AI, good level design for the most part
Bad points: The guy walks funny, I know hes meant to be sneaking but it can be a bit frustrating when theres no guards left and hes waddling along like that. The guards field of vision isnt represented by the cone on the map, you can be well inside the cone and not be seen yet be seen when ur outside the cone completely, this made navigating round their fields of vision in level 19 REALLY hard, most of the levels were easy but sometimes the difficulty went off the scale! Just remember that a good game is measured by how fun it is, and frustration does not equal fun.
Sorry if it looks like I wrote more bad stuff than good, but Im trying to give constructive criticism! Its a great game, much better than anything I could do at this point in time. So keep up the good work :)