Thank you for your feedback. The LG Aristo is not on the current list of compatible phones. We are in the process of testing and approving other phones. Please find the updated list of phones at jedichallenges.com/compatibility. It is very important that the phone you will be using for the Star Wars: Jedi Challenges is on the compatible list, otherwise the hologram images may not be as the developer intended.
It is also very important that you let the "app" that is included guide you through the entire set up process. This insures that the system will be synced correctly.

It will depend on the software requirements and compatibility. We recommend you check with the software publisher's web sites for their compatibility with Windows 10 Home 64-bit operating system and the minimum/recommended hardware requirements (Is a Graphics card required, the processor speed and the minimum required system RAM and the minimum available hard drive space) to run their program, then compare those requirements to this system's configuration.

With regard to the touchpad issues you mention with your device, there may be driver updates for your specific system. Follow the link below to look for new driver updates for your specific system. You can also run diagnostics from the Lenovo site as well. As always, be sure to create a restore point on your system before you make any changes. You can do this by just typing "restore point" in the search window within Cortana and follow the link to create a restore point. Here is the link:
https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/yoga-series/yoga-720-12ikb/downloads?linkTrack=Caps%3ABody_SearchProduct&searchType=3&keyWordSearch=Yoga%2520720-12IKB%2520Laptop%2520%2528ideapad%2529

No, there are no internal speakers within this desktop. It can support external speakers though.