1. Upgrading the pickaxe provides lesser gems.. this is annoying and makes progressions slower.
2. The pumpkin powers are mostly useless, I rarely use except in special runs. it might be better to make him provide similar permanent upgrades, for eg. reduce upgrade cost, or increase size of the farm.
3. Can we just get a permanent upgrade to make automate option enabled all the time.
4. balance. Currently i am stuck in level 13 with not gems being made to make actual progress.
Targeting has so many problems... 1. archers\wizards tend to miss tower enemies 2.wizards and archers are aiming at enemies far away than that are close by 3. i can't say this much... hitting walls like crazy. 4. getting stuck behind walls....
You are completely right, and I made improvements to these in V0.5! 1) They are perfectly accurate now. I had some random variance built in, but it seemed to annoy everyone, so I took it out and watch them go now! 2) I changed wiz/archer code to better defend and target against very close enemies. 3) I know! Still working on getting them to NEVER shoot when obstructed! V0.5 should be better at this, please try it. 4) V0.5 has updates for this, too. Hope it helps!
Look at their range. Like you, they can only cast a spell or walk. So when they turned invisible, they are still on the same spot. When they are invisible, they will take the shortest route to attack you, so you can estimate where they are and freeze them ;)
The circle of your mothership (which turns to green if you wait a bit) indicates how much resources you have. The first quarter spawns Fighters, the second Bombers, the third Frigates and the last one upgrades your mothership.
 "Idle Harvest"){kind=icon}
 "Castle Wars 2.5"){kind=icon}
 "PewPewEmUp"){kind=icon}
 "Day D: Tower Rush"){kind=icon}
 "Monster Force War 4"){kind=icon}
 "King of Battle: Idle Castle Adventure Game"){kind=icon}
 "Royal Squad"){kind=icon}
 "Road Of Fury 2"){kind=icon}
 "The Wizard"){kind=icon}
 "1Quest"){kind=icon}
 "Command & Control"){kind=icon}
 "Guild Dungeons 2"){kind=icon}
 "Keeper of the Grove"){kind=icon}
 "Pax Britannica"){kind=icon}
 "Arkandian Revenant"){kind=icon}
 "Farm Guardian"){kind=icon}
 "High Tea"){kind=icon}
 "Bug War 2"){kind=icon}
 "Consult"){kind=icon}
You are completely right, and I made improvements to these in V0.5! 1) They are perfectly accurate now. I had some random variance built in, but it seemed to annoy everyone, so I took it out and watch them go now! 2) I changed wiz/archer code to better defend and target against very close enemies. 3) I know! Still working on getting them to NEVER shoot when obstructed! V0.5 should be better at this, please try it. 4) V0.5 has updates for this, too. Hope it helps!