Thank you very much for your feedback, my friend!
It's amazing that you've already created two games with the engine. I'm really happy to hear you're enjoying using it. You're already one of the users who has created the most games with the tool!
Regarding changing weapon and monster stats, that's a natural evolution and it definitely makes sense. I just need to be careful because modifying things that are currently hardcoded defaults is a bit complex and could increase the size of the shared game URL.
A lot of people ask for larger maps. The small map size is intentional because it encourages creating small, fast-to-make games, which works really well for game jams. That said, I do think it would make sense to add support for user-defined map sizes for power users of the engine, while keeping the current small size as the default for most people.
As for adding new tiles, that's actually a very good idea. It's a bit more challenging to implement, but I'll definitely take a closer look at it.
Thank you again for the feedback! I really appreciate it.