Hello. I've played through your game and would like to add some feedback and ask some questions.
Is there a guide? Or at least a map? How many endings are there?
I somehow managed to finish this game on easy, but it feels like I missed a lot of content. I haven't found notes 4 and 6 (but got most of them 1 through 9). I don't know where to find the pickaxe for the crystals. I don't know how to open the door to the left of the golden door, near the book. There is also a door with the Tree symbol and some red sarcophagus with dripping blood and a skull symbol next to it. Maybe there is something else I missed, but I don't feel like replaying it at the moment.
I've tried playing on higher difficulties, but I didn't like the permanent death of the flashlight mechanic. It feels like there is not enough torches in the game for this mechanic to be viable. Especially at the bottom (obsidian?) levels.
I tested insane difficulty and it feels literally impossible even if you know where to go. The flashlight capacity is like 2 minutes?
My suggestion is that you add a readme file with tips and all the necessary info for players who want 100% exploration to know what to do.
Other than that this game has potential and with a bit of polishing and/or rebalancing of some key mechanics it could be close to a commercial indie release.
Good luck with your next projects! Hoping for a reply from your regarding a guide of some sorts.