you could try remapping the R key to caps lock, it works a lot better for me
That is a good idea. I use WASD-controls, so I remapped R to F. restarting is now more comfortable

But I assume the main problem was that my hands are usually not really relaxed while playing. Doing stretches helps a lot with this (as shown
here and
here. first link also has some additional tipps regarding hand health)
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on topic:
Getting those secrets is quite difficult for me. But I figured I won't git any gud by playing easy games
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