I GET IT! ITS CALLED MUU BECAUSE ITS A COW!
The bgm, flawless; The gameplay, a little glitchy at times but so much fun once you figure out how to do it and then just have to practice the timing, and the references, mwahahah epic. I loved how you included a SMB 3 Floating boat crashed down and had to use it as a platform close to the beggining, and after that all of the blocks looked like the brick blocks. Also, for some reason the last levels reminded me a little about the earlier megamans, but that may just be me...
Also, for your first game, congratulations, you have created something simple, challenging and awesome, you truly deserve the frontpage, and most of us will wait anxiously for a sequel.
(trying to make it sound like an official review from now on)
Plus:
+BGM, would download it if I could
+Graphics, simplistic and added to the mood
+Level design, loved the slopes, they really added a challenge, and the "staircase" with the robots (?) was pretty sweet
+Story, found the irony amusing... I mean, a cow falling in love with an alien, that's rich!
Minus:
-Dark enemies on dark backgrounds (seriously, they caught me off guard more than once, even when knowing their location)
-Jump timing, a couple of those were pixel jumps
-Checkpoints, sometimes, too close together and sometimes too far apart IMO
-Hitboxes, sometimes would be like 10 pixels away from the robot and it still caught me.
Also, excuse me for the long review, but this game inspired me to do so, heh...