Great idea for a game! I'm glad to see we are still hunting oil in the far reaches of space!
I liked that you could buy upgrades (I did a similar system in my game as well so I'm a fan of the mechanic).
Just some constructive feedback:
- I would invest a bit into the aesthetics of the game in the future. This is not a knock on the game art, its because at times it was hard to see the oil can against the black space, and even the astronaut can get lost against the white stars. If you don't want to use pre made game assets, you can still change the colours to make it more readable. For example, the astronaut can have the classic orange suit and oil cans can be red so you have some contrast.
Good job, keep it up!