This was fun, and it has a lot of potential to be expanded even further! I noticed how in the mines the camera moves a bit at the rhythm of the mining, which is a tiny detail that makes it way more intuitive and fun—I loved that.
Being able to crash the frost wraiths against their own blocks is a nice risk-reward situation; you can choose to either just dodge them, or try to crash them which is riskier but buys you some seconds without them around to focus on dodging spikes. I will say though that to me it always felt like just dodging the wraiths was the better choice, as they wouldn't fire if you were constantly moving up and down, but having the other option is really good.
Good job! ♥