Wow I really like the concept of your game ! It's similar to mine and at the same time it's the opposite ! Our two games are a bit like day and night lol.  My game is also made with construct and about collecting DNA, except it's not the character that you play that evolve but a boss that will try to kill you. 

Your game is a bit hard but really cool, I had a lot of trouble at first, learning the different speeds of each form etc... I like the blob face and the music too !