Thanks Matti! And thanks everyone for playing! Nice to see some "Yeah I've completed it!" and people helping each other over it 
Also, added the AGS page link in OP.

Spoiler
The equation in the triangle room is not meant to be a misdirection, but a hint : if you put this and this together you get this, so, applied to what you have... Was it understandable?
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Also, added the AGS page link in OP.