Thanks so much for playing this as well! :DDD
To answer some things, I did a lot of experimental stuff in this game, not all of it were the best ideas in hindsight, though most of them have gone over alright regardless.
For example, Makyo was made in response to a small but loud group of players who complain that my games are too easy, even on the hardest difficulty. I tried to make it very clear that it was for challenge only, with an NPC saying there's nothing good down there and a lot of "hey, this is a bad idea" warnings, but I suppose that's really not going to deter people who want answers and/or more lore.
I also put a lot of secrets in the game, mainly to see if anyone would be able to find them, but have been pretty open to just telling people how to get them if they ask, you can find the location of the bones and the triangles in responses to other players pretty easily on this page.
As for endings, I've never been huge on offering multiple ones. The first ending you get is *the* ending as far as I'm concerned. The "ending" for Makyo is more of a joke game-over, and there's technically a second ending if you go back and beat the game after completing Makyo, but it's a tiny tiny addition that I consider more of a "fun" bonus and don't consider canon.
In future games, I think I'll make any post-game content more meaningful to all players, rather than just a big challenge. Making these games is always a learning experience.
Regarding one characters' death, you cannot change that. It will happen even if you try to stall it.
Thanks again for playing and sharing your thoughts :DDDDD My next big project will probably be something more like Luxaren Allure was.