As mentioned in #14 (comment), the font rendering on linux using the java2d toolkit looks pretty rough.
Here are the screenshots from the linked comment:
clojure -M:membrane.term run-term --toolkit java2d --font-size 20

clojure -M:membrane.term:skia run-term --toolkit skia --font-size 20

Note: the way github displays the screenshots doesn't look so bad for the java2d toolkit, but if you look at the high resolution version, it should look obviously worse.