The Astronaut Pen is an example of an Insane item that is strictly worse than the previously available item, in this case the Radioactive Disk. There are plenty of ways to get to a stat maximum, but I'd say just get rid of the Pen entirely.
Controlling Mr Secret with RangeX3 Minelayer is by far the strongest strategy, yet tedious to execute. It feels like an attempt to compensate for trudging through with the crossbow. Otherwise the game has a nice balance point.
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Thank you very much!