My main thoughts on improvements (especially for a first time player) would be:
Make the controls a bit more consistent, and make sure you're letting the player know the controls for each part of the game.
I got stuck trying to burn the symbols onto the tablet, because I had to "Hold E", but those instructions couldn't be found anywhere.
I'd suggest:
- Hold RMB to Burn the Symbols into the Tablet (and show tip onscreen).
That would keep those controls the same for both actions.
:D