DBVisualizer already runs on Windows/Mac/Linux, connects to more databases, and implements just about every feature you're currently working on, plus all the ones you'll excitedly announce in the next few years -- like exporting data, query parameters, source table editing, charts, result set search, command-line interface, etc.
https://www.dbvis.com/features/
Your screenshots show so much wasted whitespace... timestamps that line wrap = half as many rows fit on the screen. Tons of unused space in the 'instagram_id' column.
A while back I used DatabaseSpy, which was also much more feature-rich than your tool. https://www.altova.com/databasespy
No relation to either tool, just a customer/user.