Man I really liked this game, I loved the little platformer experience and I was really invested in the miner's journey. In one of the levels (I think the second one), the spikes don't kill you; for that reason, I thought that it was like spelunky when you can go up to the spikes and go through them without getting damaged as long as you don't jump on them, but no the spikes worked fine in the rest of the levels so I felt like I was trolled lolol.
Were the B-sides a reference to Celeste? I love that game man, cheers!
Overall, great game! Good luck with the jam