hacking not working due to not full energy
I don't think so, I watched the bar and waited until it was full. I didn't buy many energy capacity upgrades(due to ignoring the shield since it was hard to remember activating), so it's more likely I don't even have enough energy to use it. Could be remedied by displaying the cost of an ability on its hover text, or like you said add feedback like the energy bar flashing red and playing a sound if you can't cast it.
what do you mean by stat dumping
Interesting idea there, but not what I had in mind. Commenting on that: if you wanted the upgrading between rounds to be breezy that could work. But my first thought is that it would be quite slower to scale to the same power since everything is being divvied out. Unless, you make it so more power is gained from the same amount of crystals. As is, the current system allows specialization which adds some strategy that you may lose out on. Anyways.
Currently you can drag a stat bar further than what you can afford to buy the upgrade. What I had in mind is that there is a soft cap shown on any given line(what is affordable), and as you increase one stat all other soft caps shrink until the grab bar turns green/gold and it stops increasing, thereby allowing you to quickly click drag then press buy without out slowly dragging to get as close as you can to spending all your crystals. This should make it more tactile as you can also subtract stats and see how much you can reallocate. Alternatively, if you think that's too much work then just the green/gold handle and stopping when you reach max crystals is good too.
