Thanks for linking to it too, it's fab, and great to see not only a cool idea being borrowed with credit but being done well.

It's a rare pleasure for me, actually, to see an idea of mine getting this sort of treatment. Mostly I think of myself as an engineer rather than an inventor – it's very common for me to take someone else's idea and apply solid engineering to turn it into a polished implementation (e.g. almost all my puzzles are implementations of existing game ideas, PuTTY is an implementation of existing protocols and terminal standards, my day job is mostly implementation too), but far less common for me to have an interesting original idea myself. So to see someone else picking up one of my own ideas and applying the sort of engineering I'd have been proud of is a delight. I hope I've given the same pleasure to at least some of the people whose ideas I've implemented!

On the other hand, it is also possible to invent algorithms and patterns. Tactics rather than strategy. And I know you do that.

Occasionally, yes. I did say mostly.