You mean because of the themes, or that lighting isn't bright sunny day, or is the game not running properly? Please specify since I can only help if I get the information I need. Also I'd recommend telling me what hardware (PC/Mac specs) and what OS (Linux/Mac/Windows). Then I might be able to help.
For example,
If the game is just blank, try running it on Linux (if you aren't already), since all my games are developed on Linux (Debian Linux 11/12).
If you are using MacOS, then remember the MacOS version gets NO testing, I release it because I used to do Mac Gaming, try grabbing a PC with alright specs (doesn't have to be a monster) and run Linux (or Windows if you don't wanna own your PC) on it.
I hope this helps, if it doesn't, specify the information I asked for and I'll try my best to help.