EDIT:
I decided to give this game another go.
On my first play, I rushed it thinking the top bar on the screen was a timer that you needed to refuel every few seconds and I didn't know it was actually for how many steps you could take before you blew up.
Realizing that this game takes its resource management to another level, I changed my play style accordingly. And I hate to admit...I started to enjoy it.
I have yet to beat the game, but I do have an incentive to keep playing now that I better understand its mechanics.
But, there are still a few gripes I have with it in terms of design.
Like neither of the bars having any icons that tell you what they do.
And although there ARE some sound effects in the game, they're barely noticeable.
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OLD REVIEW:
Needs a bit of work.
The goal of the game isn't all that captivating since the game feels very slippery. I also think you might motivate more players to keep playing the game if you give them an end goal like collecting X amount of money/gems or have them try to get a super ore of sorts.
I don't think you're gonna get much players engaged if the only thing there is to do in the game is upgrade the drill...when there's no real reason to.
I also feel like your drilling should have a bit of resistance or friction to it. It would add a lot more to the game, instead of having you go through every block like it was butter.
Some sound effects for drilling into different kinds of rock and acquiring ore would also have benefited the game.
There's also a few bugs I came across like being stuck in the upgrade station at times, and not being able to move anywhere else but up and left. Which can be a pain when trying to get back to the refuel station on low fuel levels.
I could see this game being a nice time waster when you want to play something simple and short. But the flaws I mentioned really take a lot out of the enjoyment I could have had with game.