Thank you! I'm a bit shocked that you've spent so much time in my game. Everything you wrote is absolutely correct, especially regarding item acquisition and balance. I haven't had a chance to tweak the balance yet, as even the basic archetypes aren't ready yet (for example, as you noted, Synapsis-based weapons don't exist yet). As for item acquisition, I'm currently working on adding text events, new biomes, and more varied challenges, as the game is currently quite repetitive. Honestly, I shouldn't have released the game in this state—I did it mostly out of fatigue, as I've been working on it for a long time without showing it to anyone, so it currently has a lot of obvious flaws. I've written down everything you mentioned, thanks!
Also, regarding the problem with some islands not connecting and the path being impassable - it was difficult to fix, but I figured it out recently and this error will no longer occur (after I download a big patch).