I have a few ideas for overhauling Mysterious Circuits.
The easiest fix: Drop the "unidentified" aspect. Throw out all the detrimental circuits, and fold the helpful ones into existing consumables and/or passives.
The easy fix: All Circuits are unidentified when you start a new save file, but the first time you use them, that circuit will become identified for
every future run on that file. This turns them into a form of progression between runs. Since all runs on a save file happen in the same "continuity", just with different heads in the mech, this makes sense - the Hydral can keep a recording of what happens every time it tests out a new circuit.
Complete overhaul idea #1 -
double-edged sword:- Mysterious Circuits are all passive, not consumable.
- Mysterious Circuits always have a harmful effect that triggers when you get hit.
- Collecting a SECOND Mysterious Circuit adds a positive effect, and a very strong one at that.
- Collecting a third circuit multiplies the positive effect.
- At first, mysterious Circuits only appear in unlocked chests, because it sucks to spend a key to access something that initially hurts more than it helps. Collecting your first circuit allows them to start spawning in locked chests and in shops.
In short, having one is bad. Having two is a toss-up. Having three or more is good, and it only gets better the more you collect. The idea is that the circuits aren't really compatible with your mech, but they are very compatible with each other, so you need several of them to unlock their potential. If you pick one up, you're kind of committing to hunting for more.
(Example harmful effects: Chance to take +1 damage from hits, chance for hits to bypass shields, damage temporarily reduces movement speed, damage temporarily reduces rate of fire, damage causes loss of energy, damage has a chance to consume a missile, enemy shots knock your mech back, increased damage from environmental hazards, reduced mercy invulnerability)
The positive effect - since you need two circuits to even see it - probably shouldn't be random. I'm thinking something like greatly boosted critical hits, since that's the closest I can think of to the sort of advantage that improved circuitry might give you (identifying enemy weak points), and you can make it highly visible.
Complete overhaul idea #2 -
AI circuitryMysterious circuits only ever have a beneficial effect, but they also house a malignant AI that will try to take over your mech. Extra "glitch" enemies will start appearing in rooms, and get steadily nastier the more circuits you have. If you have five circuits, then at the end of the run you get to fight an extra "glitch" boss as the AI makes one last attempt to take over. This is sort of the reverse of overhaul #1 above, in that they start off mostly beneficial and get more troublesome the more you have.
Circuit effects should aim to be *visible* above all else - +10% damage is good, but it's a bit hard to tell it's happening outside of boss fights. Circuit effects should be passive, because nobody wants a one-off effect that makes the entire rest of the run harder.
While this is cool and thematic, it's also the most time-consuming to implement, especially the "extra boss" thing.