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sowm is a floating window manager which runs at ~250 SLOC, if that's what you're after. The maintainer also developed KISS linux and tools like neofetch... however he's apparently went off grid, so sowm is currently not maintained.
If I were you I would take DWM, rip out the non-floating layouts (or just set the floating layout as default...). Then you can apply any patches you like. I would suggest rioresize which I'd imagine is pretty nice on a floating setup.
If you're looking for something minimal but a tad more featureful than the ~200 SLOC suggestions you may enjoy cwm. It has a tags-like method of grouping/showing windows somewhat like dwm.