I'll add a few enemies soon, i have the files ready.
As for the rest of the items, i think i added all there is. Spikes, springs, trees, checkpoints, 1UP crates, and the metal crate thing full of bunnies from the end of the zone. The image doesn't show any of them but there are many items!
If you have any specific items in mind link me to a sprite sheet or a screenshot where i can see the item im missing and i'll consider it too!
As for the size, i like it being pixel perfect but i could come up with a "big sprites version" eventually if there's enough demand for that as well
thanks for the interest, make sure to try the other ones i made!