I made it to the section where the lava starts rising, but I couldn’t get past the platforming part where you have to jump to escape it. Even after several attempts, that section felt clearly too difficult, the lava is too fast.
If you want to include platforming elements, I think it’s really important to fine-tune the physics, colliders, and the physics materials. I often got stuck on platform edges and couldn’t jump properly, which made it feel frustrating rather than challenging.
In terms of visuals, I think the game just needs a bit more polish. You could add seams or better UV work on some meshes to avoid stretched textures, and maybe make the breakable walls slightly more readable.
That said, the game is cool overall. I really enjoyed it up to that point, and the mine cart mechanic is a good idea.
Honestly, you could build a full labyrinth/puzzle game around that concept.
Hope that helps!