Well, in the web version black bars appear quickly due to a refresh ?!
Some collisions are not optimal (When you travel the kind of track where you find gold and you press up / down and right direction at the same time).
When you are near a panel, the display protrudes over the character at the level of this hair.
A blink occurs if the character is on the belt of the "conveyor belts" machine.
Looping music starts to get quite painful to the ears after a while. While I like it pretty well, I think it genuinely lacks a variance.
The game ends fairly quickly. So I suggest having the possibility of having other machines and especially a larger exploration on the map.
Although the environment is desert, I would like see a source of water for contrast.
Why not add animals whether they are peaceful or not. Snakes / scorpions / vultures could follow the player for example in order to create an additional difficulty.
Trying to find the authors of the resources would also be a good thing.