this is incredible, I have no idea how this game has only been rated by 4 people so far but this deserves so much more attention.
I found a few bugs, 1: if you get a lot of speed you will fall through the blocks (you will still die when you hit the bottom so i dont think theres any real purpose to this) , 2: i have literally no idea how i did this but , i was in the lava section (the first area where you take damage) and i fell from the top without slowing down (dont ask why...) and then i held up at the last second and i took 0 fall damage.. i have tried to recreate it but i havent been successful so im not sure what happened
for the first bug at least its pretty obvious the reason why its happen is because i was going faster than the size of each block per second and so i fell through them and stuff
anyways this game is really fun and honestly extremely similar to the first game i made as well (although i didnt publish that one online) , mine had blocks the same as this except they were bigger and the character was a drill and you had to run into blocks to mine them .. etc (a few more minor differences) , so it was really cool to see this game :)
as for feedback to the game, the only thing i would say is, it did take a long time to go back and forth so i feel like there were some minor balancing issues (ive seen the other comments talking about this as well). other than that, another small issue that I personally didnt mind but, the game was quite repetitive (as in, it was the same thing but with the new ores) , since this was just a game jam it wasnt expected to make a fully made game or anything and you already did more than enough, but thats another small thing to think about. so in future jams , you could focus on QA and testing a bit over a fully working entire game, tho tbh i dont mind. I enjoyed the game :)
I hope this game gets more attention! definitely deserved