Thank you so much!
All the gemstones can be found behind secret walls. They arent required to beat the game however.
Hints
One gem door is a few steps from the exit.
Right after the arrow pressure plate puzzle.
On the way to the “scrabble” puzzle.
Near the “tripwire” trap.
About similar games its a hard thing to recommend, this game was more of an attempt at mashing out point and click adventure games in a old school dungeon crawler packaging , with the obvious addition of giving the player the right tools to solve and keep track of puzzles without the need of an external application.
- Strella