I enjoy the uniqueness but I think this game suffers very much from tab overload so far.
I'm up to gold and I don't see any reason why Tanks / Upgrades / Researches can't all be on the same window instead of having to go back and forth between the three.
Also not sure if game is balanced around holding enter but an option to simulate holding enter would be preferrable
Edit: finished the game. Still agree with what I said above. Appreciate that the game had a concrete ending, was fun