Interesting game.
However there are a couple of glitches. After a boulder drops walking through it kills you. If you are on the elevator when the boss appears you get knocked through it forcing you to restart from the last save point.
For those playing here are few pointers. The pits with blood on them are smaller than the sight leads you to believe. Jump a bit later than you'd expect. Sometimes the pits will reveal them self giving you s split second to avoid them. If you are quick enough you can time your sight so you can rid yourself of arrow/boulder/spikes traps by using sight almost immediately after a click.
Note Spoiler!:
Lastly, due to the glitch a listed above when you reach the big boss: it will be marked a by a big bloody spike spot near a lift which will be activated when you walk left to the light and then walk back toward the lift; walk slowly past the bloody spikes so when the boss drops down it will knock you out before you reach the lift. If he knocks you down on the lift, you will drop to the level below forcing you to die or restarting from the light by the lift.