I played it until the end. The concept reminds me a bit of 'Dome keeper' with the core loop explore>upgrade>fight.
As a player when there is too much text at the same time, I partially read. So I play and did not understood at all (my fault but we are legion).
I was able to pick up chest but not to drop it, because I was dropping with the same button, witch you did because we can carry multiple things, so you need a dedicated drop button, and another button to roll those items. I think it's overcomplicated. You could take keys/map/boots/scepter one for all (Of course it changes the difficulty). Chest/Bomb can be picked-up/dropped using the same button. For chest a simple hit of the turret could drop automatically.
After taking the time to read completely 'how to play', that was clearer.
During the Fight phase there is not much to do, I think you could simply improve it by placing 3 (5?) bows at different places (but not too far), than you have to juggle from one bow to another to defeat the multiple attacks.
Once said, I like the mood of the game, the SFX and enemies. The like the exploration part with the fog of war but wish I found the map earlier ;). I had a good time. Great job.