Aoi Blink (Fan Translation)

Here comes an easy platformer that teaches you a valuable lesson about friendship and having a donkey as your best buddy. Sort of. Now this game is released only in Japan, and is translated in English in 2001 (it exist as a rom, not an official release).

Played through all the levels, so I had to go back a few times through already completed ones. To beat the game you don't have to go to each of them.