The point with the speed and waiting i agree on, i already made the intro more skipable (probably you played the version directly after posting here). the plattform point is also a good one, i thought about this too and probably am going to change this.
the speeding up sum is legit and i am grateful for your both responses.
the diagonal movement i did implement in another game i'm working on but didnt out of accident in this one and liked it. it reminded me of pokemon (if i remember right) and that made me feel good =)
that the last pressed key is the actual key is a good idea but right now i dont knowhow to accomplish. you already can walk left or right while you move up or down. i need to think into this
and thank you both for your kind words!