You can try to follow the build instructions like mentioned in another comment but be aware that you are trying to build for a platform which has as far as I can see no official ~~support~~ compile instructions for the software. YMMV.
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From what I can see, there's no R5 builds/architecture available.
https://github.com/nesbox/TIC-80?tab=readme-ov-file#build-instructions
Hence the need to build themselves. It boils down to: download the source, install the dependencies, (configure,) compile, install. In this case, you need make/cmake. You could also crosscompile (on another machine), but that's trickier. If you've never compiled something yourself, maybe start with a known-good configuration from your distribution's sources.
I've never compiled anything but time is not an issue. Will try follow some instructions.
Tho can I compile for riscv on my x88_64 laptop?