If you have any specific questions about Fennel, feel free to ask here or in #fennel or #lispgames on libera. We also have https://fennel-lang.org/from-clojure for people coming from a Clojure background.
TIC-80 is very easy to do browser-export with but it can feel limiting if you have a specific game you want to make that needs more colors or pixel resolution. Love2d is quite good; it’s a little more work to get it running in the browser but still possible, and its constraints are less severe. But you need a lot more 3rd-party stuff like art/map/music editing programs outside love2d.