You should definitely have a progress tracker for challenges, it is hard to do a challenge without a progress tracker because player wouldn't be able to tell if he/she is doing it correctly. For example, if I am doing goblin challenge 1/3, I can't tell how many seconds I have collected or how many more I need.
You should definitely check your "Fortified Wand" artifact. When it is placed in inventory and upgraded,it spawns 6 duplicates in your inventory space. If you try to remove it by selling it, a glitch occurs where the original artifact is removed from the inventory holder.
Not the biggest concern but it would be nice to know how much a building is making before we buy the building. It would be really helpful for new players in some way.
It would be nice to know what the outcome of upgrading a artifact will be, because it would greatly help with what artifact will be useful when upgraded.
A trick is to buy as much stock as you can when it gets low because the stock market will go up if you buy when there isn't much of positive correlation, just like in real life.
I love the idea of offline ticks but we should have an option of spending certain amount of ticks instantly because the ticks are taking way longer to be finished than they should.
I think TankiOnline should have a keyboard control customization system where we can change from wasd controls to whatever we desire. Hope this message is seen by a developer
Can you help the losing team get members?Because when a team is losing nobody will join and that's the way it has been since the very start of every match.