I bought my first tablet – a used Samsung Tab S4 for £170 – and it can run EBF5 smoothly at a massive 2560×1600 resolution. It’s really too bad that Flash on Windows never got the optimizations that Android and iOS got. Most gaming PCs can’t run Flash games at that resolution…
So the lesson is… buy a used Android tablet if you want to play EBF5 as cheaply as possible.
I gotta say though, that playing it on a smaller device with your thumbs is a bit more comfortable than playing it with a stylus. Tablets seem to be better for games that require less interaction, or only have buttons near the edges where it’s easy to reach them. Or uh… office presentations.