One more that is outside of the swarm survival genre, Child of Light. Though there is a fun and endearing story that irecommend, once you get through the first 20 minutes, you can kind of just not care and enjoy the simple but interesting play style of an almost-turned-based RPG.

I would just look through any number of online list of “Best Swarm Survivors”. There’s dozens of different themes and tweaks from the VS formula, including boat and train varieties! I also watch the YouTube channel Never Nathaniel as he’s a pretty awesome source of both info and entertainment on the matter (as well as other games). He’s literally the only streamer I’ve watched and I couldn’t tell you why, his formula just works.

Many roguelites could fall into this category, and are generally cheap to boot (i.e. vampire survivors).