Nice work! I really enjoyed running around fast, it kinda reminding me of playing Sonic running around collecting ores. The background music complemented that well and the character and environment were fun to look at too.
I wasn’t quite sure what to make of the depth (temperature?) dial on the top of the screen so I was a bit scared to go too far down at first (didn’t want to lose all my sweet loot!), but I got over it eventually.
The map was nice and helped me avoid feeling lost in the caverns, so thanks for adding that! Unfortunately I didn’t get to spend much of my loot after running around for a while since after I bought one of the teleporters (3, I think?) the game seemed to crash on me :(
Great job for your first game, I hope you enjoyed it!