Hi! Thank you for your post. Regarding the trial/demo status of QLRZ, I answered the message you left on the game's page:
"QLRZ is indeed a demo. Albeit I had high hopes for it when I published it in 2015, after developing it for almost 3 years, it never got a lot of downloads (think < 500). So Arcade mode is not locked to premium buyers, it's a feature that was on the roadmap for a future development that simply never occured. Hope you still had fun with the part of the game that does exist!"
Also, apologies about any technical difficulties you might have encountered related to the installation of the game. Don't hesitate reporting any specific error message you might get.
Thanks again, and have a nice day!