This game is so good! Great job, and cheers on your first GMTK Game Jam! This year was also my first jam where I tried to simplify and just build something fun, so your development story really resonates with me personally. I'd love if you tried out my game too and shared your feedback with me!
I particularly like how you expressed the loop theme by unlocking more disasters on each play through. It's funny to think that the "disasters" are the fun part of the game and that we as players want to unlock them! I found the pacing of the disasters expertly tuned to keep me moving and keep me engaged. My only point of feedback is I wish I could jump through the roof of the carts. Sometimes I missed a jump because I clonked my head and fell into the lava. But even that wasn't so bad because in the beginning at least it meant I just got to unlock more disasters!
Seriously, great job! Cheers!