Hi,
(http://www.lixgame.com/etc/bug-lifetime-2017-12-15.png)
This is a graph of open Lix issues (https://github.com/SimonN/LixD/issues), from mid-2015 to end of 2017. As of 0.9.5, I have 60 open issues and 207 closed.
The big drop in mid-2017 was the release of Lix 0.8. I didn't stabilize any of 0.7's physics and we went to patch version 0.7.23 before we were satisfied. This fixed a ton of bugs. Physics bugs are purple; the number of physics bugs only drops on a minor version bump.
Website that renders this graph (https://9-volt.github.io/bug-life/?repo=simonn/lixd) -- you can mouse over a date to see statistics, and you get a nice graph with lifetimes of individual bugs. In that indivdual-bug-lifetime graph, you see that several issues from early 2016 are still open. The longest-living bug that eventually got fixed was #4: Game ignores large animated tiles on graphics cards with max-texture-size 4096.
-- Simon