This is unbelievably positive feedback, and it made my day receiving it (both on your stream and reading this comment)! This is the first "complete" game I've made, and I was definitely aided by choosing a very simple premise with no pixel art. There's no way I would have come close with a hex tactics game, for instance ;)
Haha 1024 pixels high was a very solid guess, it's 512 (gotta love powers of two).
I completely agree that guaranteeing a path would be the way to go (maybe with the addition of some time-based element like rising lava), since right now the optimal strategy is staying as high as possible, but I found that I had the most fun catching up after falling behind.
Thanks again <3