I've played around with the TIC-80 and I gotta say that the development environment is something that is enjoyable for small projects but larger projects are a headache.
If you're doing a larger project on it then I think you need to re-calibrate your expectations. It's more for educational play.
I like the 'batteries included' aspect of it; I wish more 'for practical use' development systems had that. The fact that you can package the result for different platforms, makes it interesting for trying out game mechanics on the go and distributing them inside small games. The style it was made in works on low res, small screens, so programming on small devices (small (cheap) Android tablets, GPD Pocket(high res but small screen), Pandora, Pyra etc) is ok.
The last "practical" environment that was really batteries included, as far as I can tell, was Macromedia Flash. It lives on as Haxe, the FlashDevelop IDE feels like a blast from the past (it feels so lightweight!) and it supports quite a few platforms (web, mobile, etc). But it's awfully niche now.
It was not designed for games at all. Making games in in was too hacky.
Per the Itch.io page, you can use the $5 premium version which has features like saving as text and allowing you to edit in an external editor, which might help. Pico-8 has this by default, and can definitely confirm it would be awful to try and code a whole game in the built-in editor.