The 8-bit pixel art was super cute and i liked that you showed us the whole area at the start, this tells us what we need to do without even needing a tutorial. I also thought the idea was really great, and limiting this by not allowing falling through 2 blocks made it perfectly balanced. I also really appreciated the checkpoints throughout
In terms of gameplay, i found the player movement to be too fast, it definitely took getting used to but made precise jumps much more difficult, but thank you for infinite lives. The hit boxes for the spikes etc were felt fair. Unfortunately i got stuck in the yellow bit below the second chest to the left. I could not figure out where to go, so i left it there.
Overall, this was a really good entry for the jam Gg!