It was actually the concept of not using a traditional health bar that inspired the game in the first place! Using your light as the health, though i do appreciate that some form of numerical timer or indicator might still be helpful. I tweaked the balance quite a bit during development and i actually reigned it in quite a bit- perhaps that meant it takes too long to grow in power (you for sure notice when you get a legendary upgrade, thats for sure).
The power of upgrades varies a lot, and thats cause i was cheap and use the same values for them all - that does lead to power imbalances where +1 autolaser literally gives you another laser, but the same upgrade for plasma just gives it one piercing. Balance is definitely something i want to keep working on, 100% want the player to be a god at the end, but also want there to be an end rather than the game crashing to end every match XD