You've done a nice job of evening out the character weights. As an exercise, I think it's already a success! If you want to push it further...
Monolines can be tough. Getting that stroke weight optically consistent should be your first priority.
It does look an awful lot like Helvetica. I think you could afford to take some more liberties, go a little crazy, then pull it back.
The vertical cut on the arms of the K and k is at odds with the rest of the terminals (maybe this feature is something you can play with to differentiate your typeface from other monolines). The hook on the G, and to a degree the tail of the Q, feel a little more forced than the rest of your solutions; they might warrant a little more sketching.
Keep going and keep learning!