I think the premise of collecting monster DNA to active abilities is clever, but it was not explained well, so I didn't quite understand how to take advantage. More feedback when using the syringes (some sort of sound of effect) would help. After clicking on them they seem to simply disappear, so it was unclear that anything had happened.
I agree with some of the other comments here, too, that the player feel is a little floaty and hard to control. The character seemed to gain a bit of momentum while jumping that would carry it past where I wanted to go and letting off the movement key didn't reduce that momentum as much as I would like.
A good start, though. There's potential in there!