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I like the node concept. I'm having a little trouble understanding why some attack chains aren't working. I'm checking the attack delay in milliseconds, but it seems like sometimes it takes 3 seconds for a chain to activate. It's a bit random.
It's not addictive enough to start the "Beginner Lower" difficulty and other levels. I don't receive any power-ups from my characters, regardless of my actions. I didn't understand the use of Q Spread. I don't feel like it helps. The gold penalty is very frustrating, and the upgrade costs become too high very quickly. This makes it impossible to feel the power increase and reduces the addictive effect.
I didn't realize I could have 4 characters at the same time the first time I played. I thought they were separate save files where you could replay a run with different characters. I had to read the manual to learn it.
Minor bug: every time the "Nova" node is used, there's a 0.25-second freeze. If you only have one Nova, it's an acceptable, if annoying, inconvenience. But if you build several Novas in a chain, it's simply unplayable.
Very good foundation, keep it up!