never too late to give heimer donger a mymu!
He should get more upgrades..like have 9 or 10 potential spells, not just 6. The passive is pretty lame... doesn't really add to his kit, and most heroes 1 or 2 hit destroy his turrets anyways.
My idea is his passive should be drones upgrading all his other abilities once every 60/45/30.
And even the passive becomes a targetable ability, that can fly to an ally/himself and give a small % heal + speed boost zap
passive click Q becomes a flying turret that shields him for a small amount and damages nearby enemies.. read some of the other ideas in the reddit.