Thank you kindly for the feedback! But yeah, problem is I wanted to include some pickable health but I didn't quite know how to implement it in the game's context. Alternatively I could have added a checkpoint in the middle but I didn't know where and didn't have the time. My only solution was to make the spikes deal less damage. (Originally they dealt 50 which was quite brutal.)
Thank you for the feedback! I think you can use both hands actually, I don't know if you have that key but there is another "Shift" key on the right side of the keyboard as well. Also I tried using the left hand for dash and jump (Shift and Space) and the right one for the arrows and it worked quite well.