The graphics and style are cool!
As other said the gameplay is confusing, not knowing when I'm looping or going to a new place (slide). At some point I started thinking in slides instead of being in a maze to be able to progress.
I wasn't sure if the room with the boxes was a good end. At some point I decided I had seen everything and that was the win screen. Overall the communication with the player is poor (and that does not mean adding more text necessarily!)
Then I had a look at the slides inside ppt and found there are some cool puzzles. I tried a bit with the last one playing from that slide. But the motivation was gone and I wasn't sure if I was missing some information to solve it.
The navigation part and the puzzles feel a bit disconnected. The puzzles by themselves with a simpler maze (not reusing images) could have worked really great on me. The atmosphere really fits with these myst-like puzzles and the clues embedded in the graphics (like the carved stones).