The current powercell system feels like it's not as engaging as the other systems and I've identified a couple of things I think are the cause but also a couple of solutions to it.
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Lack of choice. Yes, you can pick which cell is in the first spot to choose which bonuses you get, but this only ends up mattering if you are pushing overdrive. All other times, your upgrades are all or nothing. If you're not pushing OD, there's never even a reason to open this system.
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Temporary upgrades. The fact that, if you're not pushing it, you only have the bonuses created by completed loops also contributes to just ignoring it most of the time.
What I propose is a slight change that I think will be more engaging:
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Mix and match bonuses. Rather than switch between a set of four bonuses, each column is individually chosen between a growing list of options as you progress. More player choice to put more power where they want it.
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Rows permanently stay filled until a new loop is hit. If you fill the top row that's that. You get to use that row to get whatever bonuses you move up there, even if you do pushing OD. As more rows are unlocked, more rows can stay filled. Once you hit a loop, they all drain and you have all bonuses upgraded permanently and can start filling again.
It's not a big change from the current system. I don't think it unbalances anything and only smooths out some curves, but I think it'll do a lot to encourage more engagement with it and make a lot of people happier as they push.