Nice little game. I wish buried trinkets didn't take away control from the player though.
There's a teleport near the red door, on the left. That takes you to a place where you can get teleported to a new area (although one of the teleports in there takes you back to the red door).
The caves are basically Empty Clip's "water" level 😉.
Nope, playing the game is donation enough 😉
Empty Clip is a FOSS top-down shooter action RPG
https://jazztickets.itch.io/empty-clip