I need to see if the Guis & Ui works on other computers.
...no you don't. You're not writing in some low-level language that could be affected by different CPU instruction sets or whatever other hardware differences, you're writing in a very high-level language that is interpreted by Blockland. If a computer runs blockland, it'll run your add-ons. The only possible difference is whether it looks fine in a smaller resolution, which you can change yourself.
Also a GUI is a type of UI, and since I don't your making a command line interface or other type of interface within blockland, saying "GUIs and UIs" in redundant