Pulsar is a fork of Atom under active development. We don’t publish a flatpak (yet) but there is a community maintained flatpak for it.
Otherwise if you want to look at something else I’d give Lite XL, Lapce or even Zed (it has now been open sourced and looks like it has a flatpak available) a look as interesting alternatives.
Mandatory breath tests at the gate with additional fees to pay for every 0.01% over a certain limit (but if you pay up front you can get as pissed as you like)