Very cute platformer! On KBM it was a bit hard to make some of these jumps, but I know that's already feedback other people have given. I liked collecting the apples but it seemed like there wasn't much incentive for doing that other than for the sake of collecting itself. Maybe there should be a certain number of apples needed to unlocked new levels, or the apples could be a currency for some kind of upgrade shop?
I also ran into a bug. After I played the first two levels, I then clicked on the locked fourth level, which seems to have loaded it but the screen was totally black.
Overall cute idea and nice job!