I like the game in general, nice graphics and gameplay. I think there are some points that can be improved.
The scrolling is making the game too fast, I don't know if it will be better without it, probably it's just fine like that or something else could be worked out.
I have to die too many times until I can get some upgrades.
The movement controls are not very well done or at least it was not easy for me to get used to them. Shift key isn't supposed to accelerate the hero if you start pressing it in the air, I read that it is for running, not for flying.
These are just comments to try to help you out, don't get mad at me if you do not agree, it is just my opinion. I am always glad to receive such feedback, so I am giving, too.
You did a great job already, congrats!