Very interesting take on the theme. The main mechanic is quite clever but deserves a bit more explanation in game. It would be nice if I can also control with WASD then I will be able to comfortably control with one hand. But very enjoyable game that reminds me of a little DOS game called Tower of the Sorcerer which I also really liked. Finding the correct pathway and order to preserve your resource is pretty fun. Although can be quite unforgiving too given the nature of the open-world.
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thanks for playing, i decided to go with the minimal explanation and let the player figure it out. Oooo funny u said that, i have played games where they only had WASD but not the arrow keys, and found them annoying too (noted for future games to include wasd control) - ah yes, the correct pathway is hard - maybe an earlier cutscene showing the 4 doors map could helped, or remove the secret path on the map with the blue key, letting the player decide when to use the key might help too (i should have swapped the blue door with either red/green door (to mitigate the requirement to restart if wasted the blue key), and maybe add a few more gems along the way