This was a pretty well made platformer.  It controls well the level art looks really nice and most of the audio fit well too (although the sound for jumping on an enemy sounded way more realistic than the video game style sounds for everything else).  I think what stands out the most is the level design, I could really tell the paths and challenges were thought out.  The boss was a good design, like a scarier version of an early enemy, but I think the shooting phase could be faster, at first I thought I needed to do something to him because nothing was changing.  I like the introduction of new harder enemies in the sand zone, but it seemed like the levels were the same as the previous zone, but I assume they are still being worked on.  Oh also I only speak english, so I'm not sure if I missed anything with the dialog at the beginning lol, but it didnt seem hard to figure out what to do.  This has alot of potential, good work!