cool game, and while the execution was a bit primitive, the concept was really cool. the movement speed is way too high though so platforming is really difficult. All of my deaths were nearly instant from flailing rapidly to get out of the water that drains my health at 30hp/s or from the strange fall damage mechanic that sometimes instantly killed me from colliding with things wrong or falling from heights slightly above my jump height. Overall, the game is pretty good and I'd love to see more.
(Edit)
I realized a bit after I wrote this what the movement speed problem might be. I took a look at the source code and I think I got it. Your Move() function is under the Update() function, which runs every frame. The problem is, Update() runs considerably more often if you're playing on a faster pc so when I tried it I ran super fast. I believe if you change your update function to a FixedUpdate() function it will fix the problem.