Big thank you for reply, I really appreciate it!
Most skills I added just to cover maximum game mechanics, with unique behavior for every of them.
I am not sure about mouse moving mechanic and thinking to change it on wasd, but this will lower max skills count to 6. (Mouse,q,e,r,f) Also, Im thinking about combo with different skills; adding hold key alternatives for abilities and combos with it (hold to big fireball). May be even change game tittle after this changes.
You right, beam is strong only when its upgraded. Different terrain changes speed, it's barely noticeable.