Told you... where is your closing power rail?
You won't get any power flow from your buttons to the lamp if you don't close the circuit. In any case, it is always useful to simulate the program before uploading it to OpenPLC Runtime, just to make sure everything is in the right place. If you don't know how to do that, I strongly recommend you to go check on the REFERENCE page of the OpenPLC website: https://www.openplcproject.com/reference
Also, it is wise to check your wiring and connections, make sure all your buttons have pull-down resistors, otherwise they will fluctuate when not pressed giving you incorrect results.